72551220377671 has 16 divisors (see below), whose sum is σ = 85813663763520. Its totient is φ = 60044546027520.

The previous prime is 72551220377663. The next prime is 72551220377737. The reversal of 72551220377671 is 17677302215527.

It is a cyclic number.

It is not a de Polignac number, because 72551220377671 - 2³ = 72551220377663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72551226377671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1303022206 + ... + 1303077883.

It is an arithmetic number, because the mean of its divisors is an integer number (5363353985220).

Almost surely, 2^{72551220377671} is an apocalyptic number.

72551220377671 is a deficient number, since it is larger than the sum of its proper divisors (13262443385849).

72551220377671 is a wasteful number, since it uses less digits than its factorization.

72551220377671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606100234.

The product of its (nonzero) digits is 8643600, while the sum is 55.

The spelling of 72551220377671 in words is "seventy-two trillion, five hundred fifty-one billion, two hundred twenty million, three hundred seventy-seven thousand, six hundred seventy-one".