65721015172 has 24 divisors (see below), whose sum is σ = 115418157120. Its totient is φ = 32744603040.

The previous prime is 65721015127. The next prime is 65721015193. The reversal of 65721015172 is 27151012756.

65721015172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1292347 + ... + 1342237.

It is an arithmetic number, because the mean of its divisors is an integer number (4809089880).

Almost surely, 2^65721015172 is an apocalyptic number.

It is an amenable number.

65721015172 is a deficient number, since it is larger than the sum of its proper divisors (49697141948).

65721015172 is a wasteful number, since it uses less digits than its factorization.

65721015172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51051 (or 51049 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 37.

The spelling of 65721015172 in words is "sixty-five billion, seven hundred twenty-one million, fifteen thousand, one hundred seventy-two".