72169812456 has 64 divisors (see below), whose sum is σ = 206470788480. Its totient is φ = 20592814080.

The previous prime is 72169812431. The next prime is 72169812457. The reversal of 72169812456 is 65421896127.

It is a junction number, because it is equal to n+sod(n) for n = 72169812399 and 72169812408.

It is not an unprimeable number, because it can be changed into a prime (72169812457) 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, 154401 + ... + 410096.

It is an arithmetic number, because the mean of its divisors is an integer number (3226106070).

Almost surely, 2^72169812456 is an apocalyptic number.

It is an amenable number.

72169812456 is an abundant number, since it is smaller than the sum of its proper divisors (134300976024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72169812456 is a wasteful number, since it uses less digits than its factorization.

72169812456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565274 (or 565270 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 51.

The spelling of 72169812456 in words is "seventy-two billion, one hundred sixty-nine million, eight hundred twelve thousand, four hundred fifty-six".