72197613551 has 8 divisors (see below), whose sum is σ = 83141418624. Its totient is φ = 61411273560.

The previous prime is 72197613511. The next prime is 72197613559. The reversal of 72197613551 is 15531679127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-72197613551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72197613496 and 72197613505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72197613559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39365285 + ... + 39367118.

It is an arithmetic number, because the mean of its divisors is an integer number (10392677328).

Almost surely, 2^72197613551 is an apocalyptic number.

72197613551 is a deficient number, since it is larger than the sum of its proper divisors (10943805073).

72197613551 is a wasteful number, since it uses less digits than its factorization.

72197613551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78732541.

The product of its digits is 396900, while the sum is 47.

The spelling of 72197613551 in words is "seventy-two billion, one hundred ninety-seven million, six hundred thirteen thousand, five hundred fifty-one".