72915293771 has 4 divisors (see below), whose sum is σ = 72990698352. Its totient is φ = 72839889192.

The previous prime is 72915293743. The next prime is 72915293797. The reversal of 72915293771 is 17739251927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17739251927 = 283 ⋅62682869.

It is a cyclic number.

It is not a de Polignac number, because 72915293771 - 2¹⁴ = 72915277387 is a prime.

It is a super-2 number, since 2×72915293771² (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 (72915299771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37700840 + ... + 37702773.

It is an arithmetic number, because the mean of its divisors is an integer number (18247674588).

Almost surely, 2^72915293771 is an apocalyptic number.

72915293771 is a deficient number, since it is larger than the sum of its proper divisors (75404581).

72915293771 is an equidigital number, since it uses as much as digits as its factorization.

72915293771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75404580.

The product of its digits is 1666980, while the sum is 53.

The spelling of 72915293771 in words is "seventy-two billion, nine hundred fifteen million, two hundred ninety-three thousand, seven hundred seventy-one".