72857143657 has 4 divisors (see below), whose sum is σ = 72860100736. Its totient is φ = 72854186580.

The previous prime is 72857143649. The next prime is 72857143687. The reversal of 72857143657 is 75634175827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72857143657 - 2³ = 72857143649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72857143598 and 72857143607.

It is not an unprimeable number, because it can be changed into a prime (72857143637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1441269 + ... + 1490962.

It is an arithmetic number, because the mean of its divisors is an integer number (18215025184).

Almost surely, 2^72857143657 is an apocalyptic number.

It is an amenable number.

72857143657 is a deficient number, since it is larger than the sum of its proper divisors (2957079).

72857143657 is a wasteful number, since it uses less digits than its factorization.

72857143657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2957078.

The product of its digits is 9878400, while the sum is 55.

The spelling of 72857143657 in words is "seventy-two billion, eight hundred fifty-seven million, one hundred forty-three thousand, six hundred fifty-seven".