74792665821 has 4 divisors (see below), whose sum is σ = 99723554432. Its totient is φ = 49861777212.

The previous prime is 74792665813. The next prime is 74792665823. The reversal of 74792665821 is 12856629747.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 74792665821 - 2³ = 74792665813 is a prime.

It is a super-2 number, since 2×74792665821² (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 (74792665823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12465444301 + ... + 12465444306.

It is an arithmetic number, because the mean of its divisors is an integer number (24930888608).

Almost surely, 2^74792665821 is an apocalyptic number.

It is an amenable number.

74792665821 is a deficient number, since it is larger than the sum of its proper divisors (24930888611).

74792665821 is a wasteful number, since it uses less digits than its factorization.

74792665821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24930888610.

The product of its digits is 10160640, while the sum is 57.

The spelling of 74792665821 in words is "seventy-four billion, seven hundred ninety-two million, six hundred sixty-five thousand, eight hundred twenty-one".