129002370561 has 9 divisors (see below), whose sum is σ = 186338313889. Its totient is φ = 86000862036.

The previous prime is 129002370503. The next prime is 129002370589. The reversal of 129002370561 is 165073200921.

The square root of 129002370561 is 359169.

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

129002370561 is a `hidden beast` number, since 1 + 2 + 9 + 0 + 0 + 23 + 70 + 561 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 129002370561 - 2¹⁷ = 129002239489 is a prime.

It is a super-2 number, since 2×129002370561² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129007370561) 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, 1017646 + ... + 1137368.

Almost surely, 2^129002370561 is an apocalyptic number.

129002370561 is the 359169-th square number.

129002370561 is the 179585-th centered octagonal number.

It is an amenable number.

129002370561 is a deficient number, since it is larger than the sum of its proper divisors (57335943328).

129002370561 is an frugal number, since it uses more digits than its factorization.

129002370561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239452 (or 119726 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

Multiplying 129002370561 by its sum of digits (36), we get a square (4644085340196 = 2155014²).

The spelling of 129002370561 in words is "one hundred twenty-nine billion, two million, three hundred seventy thousand, five hundred sixty-one".