29656628521 has 15 divisors (see below), whose sum is σ = 32159487521. Its totient is φ = 27348484488.

The previous prime is 29656628501. The next prime is 29656628587. The reversal of 29656628521 is 12582665692.

The square root of 29656628521 is 172211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14704230121 + 14952398400 = 121261^2 + 122280^2 .

It is not a de Polignac number, because 29656628521 - 2⁹ = 29656628009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29656628501) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 29103150 + ... + 29104168.

Almost surely, 2^29656628521 is an apocalyptic number.

29656628521 is the 172211-st square number.

29656628521 is the 86106-th centered octagonal number.

It is an amenable number.

29656628521 is a deficient number, since it is larger than the sum of its proper divisors (2502859000).

29656628521 is an frugal number, since it uses more digits than its factorization.

29656628521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090 (or 1032 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 52.

The spelling of 29656628521 in words is "twenty-nine billion, six hundred fifty-six million, six hundred twenty-eight thousand, five hundred twenty-one".