71720105901915 has 64 divisors (see below), whose sum is σ = 117369337881600. Its totient is φ = 37386328066560.

The previous prime is 71720105901863. The next prime is 71720105902057. The reversal of 71720105901915 is 51910950102717.

It is not a de Polignac number, because 71720105901915 - 2¹¹ = 71720105899867 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 924511069 + ... + 924588641.

It is an arithmetic number, because the mean of its divisors is an integer number (1833895904400).

Almost surely, 2^{71720105901915} is an apocalyptic number.

71720105901915 is a deficient number, since it is larger than the sum of its proper divisors (45649231979685).

71720105901915 is a wasteful number, since it uses less digits than its factorization.

71720105901915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84004.

The product of its (nonzero) digits is 198450, while the sum is 48.

The spelling of 71720105901915 in words is "seventy-one trillion, seven hundred twenty billion, one hundred five million, nine hundred one thousand, nine hundred fifteen".