72151721015 has 12 divisors (see below), whose sum is σ = 95168717112. Its totient is φ = 52473978480.

The previous prime is 72151721009. The next prime is 72151721021. The reversal of 72151721015 is 51012715127.

It is an interprime number because it is at equal distance from previous prime (72151721009) and next prime (72151721021).

It is not a de Polignac number, because 72151721015 - 2⁴ = 72151720999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59628917 + ... + 59630126.

It is an arithmetic number, because the mean of its divisors is an integer number (7930726426).

Almost surely, 2^72151721015 is an apocalyptic number.

72151721015 is a deficient number, since it is larger than the sum of its proper divisors (23016996097).

72151721015 is a wasteful number, since it uses less digits than its factorization.

72151721015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119259070 (or 119259059 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 32.

The spelling of 72151721015 in words is "seventy-two billion, one hundred fifty-one million, seven hundred twenty-one thousand, fifteen".