156675000721 has 64 divisors (see below), whose sum is σ = 176161112064. Its totient is φ = 138726604800.

The previous prime is 156675000709. The next prime is 156675000739. The reversal of 156675000721 is 127000576651.

It is a happy number.

It is a 6-Lehmer number, since φ(156675000721) divides (156675000721-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 156675000721 - 2⁵ = 156675000689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156675000791) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 609630225 + ... + 609630481.

It is an arithmetic number, because the mean of its divisors is an integer number (2752517376).

It is a Poulet number, since it divides 2^156675000720-1.

Almost surely, 2^156675000721 is an apocalyptic number.

It is an amenable number.

156675000721 is a deficient number, since it is larger than the sum of its proper divisors (19486111343).

156675000721 is a wasteful number, since it uses less digits than its factorization.

156675000721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610.

The product of its (nonzero) digits is 88200, while the sum is 40.

The spelling of 156675000721 in words is "one hundred fifty-six billion, six hundred seventy-five million, seven hundred twenty-one", and thus it is an aban number.