74836530957721 has 9 divisors (see below), whose sum is σ = 81036128672031. Its totient is φ = 69079770920472.

The previous prime is 74836530957701. The next prime is 74836530957751. The reversal of 74836530957721 is 12775903563847.

The square root of 74836530957721 is 8650811.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 11070492745225 + 63766038212496 = 3327235^2 + 7985364^2 .

It is not a de Polignac number, because 74836530957721 - 2²⁵ = 74836497403289 is a prime.

It is a super-2 number, since 2×74836530957721² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (74836530957701) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 112127820 + ... + 112793266.

It is a 1-persistent number, because it is pandigital, but 2⋅74836530957721 = 149673061915442 is not.

Almost surely, 2^{74836530957721} is an apocalyptic number.

74836530957721 is the 8650811-st square number.

74836530957721 is the 4325406-th centered octagonal number.

It is an amenable number.

74836530957721 is a deficient number, since it is larger than the sum of its proper divisors (6199597714310).

74836530957721 is an frugal number, since it uses more digits than its factorization.

74836530957721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330920 (or 665460 counting only the distinct ones).

The product of its (nonzero) digits is 266716800, while the sum is 67.

The spelling of 74836530957721 in words is "seventy-four trillion, eight hundred thirty-six billion, five hundred thirty million, nine hundred fifty-seven thousand, seven hundred twenty-one".