74753690821 has 4 divisors (see below), whose sum is σ = 74754821644. Its totient is φ = 74752560000.

The previous prime is 74753690813. The next prime is 74753690849. The reversal of 74753690821 is 12809635747.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12809635747 = 1171 ⋅10939057.

It can be written as a sum of positive squares in 2 ways, for example, as 38724336225 + 36029354596 = 196785^2 + 189814^2 .

It is a 4-Lehmer number, since φ(74753690821) divides (74753690821-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 74753690821 - 2³ = 74753690813 is a prime.

It is a super-2 number, since 2×74753690821² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74753690321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459660 + ... + 600661.

It is an arithmetic number, because the mean of its divisors is an integer number (18688705411).

It is a 2-persistent number, because it is pandigital, and so is 2⋅74753690821 = 149507381642, but 3⋅74753690821 = 224261072463 is not.

Almost surely, 2^74753690821 is an apocalyptic number.

It is an amenable number.

74753690821 is a deficient number, since it is larger than the sum of its proper divisors (1130823).

74753690821 is a wasteful number, since it uses less digits than its factorization.

74753690821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130822.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 74753690821 in words is "seventy-four billion, seven hundred fifty-three million, six hundred ninety thousand, eight hundred twenty-one".