72157301506 has 8 divisors (see below), whose sum is σ = 111161248380. Its totient is φ = 35103552048.

The previous prime is 72157301473. The next prime is 72157301537. The reversal of 72157301506 is 60510375127.

It can be written as a sum of positive squares in 2 ways, for example, as 62820910881 + 9336390625 = 250641^2 + 96625^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487549261 + ... + 487549408.

Almost surely, 2^72157301506 is an apocalyptic number.

72157301506 is a deficient number, since it is larger than the sum of its proper divisors (39003946874).

72157301506 is a wasteful number, since it uses less digits than its factorization.

72157301506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975098708.

The product of its (nonzero) digits is 44100, while the sum is 37.

The spelling of 72157301506 in words is "seventy-two billion, one hundred fifty-seven million, three hundred one thousand, five hundred six".