72665451450 has 72 divisors (see below), whose sum is σ = 195273690300. Its totient is φ = 19372903680.

The previous prime is 72665451433. The next prime is 72665451479. The reversal of 72665451450 is 5415456627.

72665451450 is a `hidden beast` number, since 7 + 2 + 66 + 545 + 1 + 45 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 9262715049 + 63402736401 = 96243^2 + 251799^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72665451396 and 72665451405.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2183536 + ... + 2216564.

Almost surely, 2^72665451450 is an apocalyptic number.

72665451450 is an abundant number, since it is smaller than the sum of its proper divisors (122608238850).

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

72665451450 is a wasteful number, since it uses less digits than its factorization.

72665451450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37936 (or 37928 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 45.

The spelling of 72665451450 in words is "seventy-two billion, six hundred sixty-five million, four hundred fifty-one thousand, four hundred fifty".