29900980561 has 15 divisors (see below), whose sum is σ = 31628162681. Its totient is φ = 28268106444.

The previous prime is 29900980537. The next prime is 29900980573. The reversal of 29900980561 is 16508900992.

The square root of 29900980561 is 172919.

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

It is not a de Polignac number, because 29900980561 - 2⁷ = 29900980433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29900980261) 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, 62423520 + ... + 62423998.

Almost surely, 2^29900980561 is an apocalyptic number.

29900980561 is the 172919-th square number.

29900980561 is the 86460-th centered octagonal number.

It is an amenable number.

29900980561 is a deficient number, since it is larger than the sum of its proper divisors (1727182120).

29900980561 is an frugal number, since it uses more digits than its factorization.

29900980561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 49.

Multiplying 29900980561 by its sum of digits (49), we get a square (1465148047489 = 1210433²).

The spelling of 29900980561 in words is "twenty-nine billion, nine hundred million, nine hundred eighty thousand, five hundred sixty-one".