74827555021 has 8 divisors (see below), whose sum is σ = 76150803960. Its totient is φ = 73515568128.

The previous prime is 74827555013. The next prime is 74827555133. The reversal of 74827555021 is 12055572847.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4544242921 + 70283312100 = 67411^2 + 265110^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 74827555021 - 2³ = 74827555013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74827555001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2802106 + ... + 2828683.

It is an arithmetic number, because the mean of its divisors is an integer number (9518850495).

Almost surely, 2^74827555021 is an apocalyptic number.

It is an amenable number.

74827555021 is a deficient number, since it is larger than the sum of its proper divisors (1323248939).

74827555021 is a wasteful number, since it uses less digits than its factorization.

74827555021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5631023.

The product of its (nonzero) digits is 784000, while the sum is 46.

The spelling of 74827555021 in words is "seventy-four billion, eight hundred twenty-seven million, five hundred fifty-five thousand, twenty-one".