129723216125 has 16 divisors (see below), whose sum is σ = 167116984320. Its totient is φ = 100430874000.

The previous prime is 129723216107. The next prime is 129723216143. The reversal of 129723216125 is 521612327921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129723216107) and next prime (129723216143).

It is not a de Polignac number, because 129723216125 - 2¹⁸ = 129722953981 is a prime.

It is a super-2 number, since 2×129723216125² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16734605 + ... + 16742354.

It is an arithmetic number, because the mean of its divisors is an integer number (10444811520).

Almost surely, 2^129723216125 is an apocalyptic number.

It is an amenable number.

129723216125 is a deficient number, since it is larger than the sum of its proper divisors (37393768195).

129723216125 is an equidigital number, since it uses as much as digits as its factorization.

129723216125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33477005 (or 33476995 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The spelling of 129723216125 in words is "one hundred twenty-nine billion, seven hundred twenty-three million, two hundred sixteen thousand, one hundred twenty-five".