156722790457 has 4 divisors (see below), whose sum is σ = 157276581520. Its totient is φ = 156168999396.

The previous prime is 156722790439. The next prime is 156722790463. The reversal of 156722790457 is 754097227651.

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 a de Polignac number, because none of the positive numbers 2^k-156722790457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 156722790398 and 156722790407.

It is not an unprimeable number, because it can be changed into a prime (156722790467) 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, 276895107 + ... + 276895672.

It is an arithmetic number, because the mean of its divisors is an integer number (39319145380).

Almost surely, 2^156722790457 is an apocalyptic number.

It is an amenable number.

156722790457 is a deficient number, since it is larger than the sum of its proper divisors (553791063).

156722790457 is an equidigital number, since it uses as much as digits as its factorization.

156722790457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553791062.

The product of its (nonzero) digits is 7408800, while the sum is 55.

The spelling of 156722790457 in words is "one hundred fifty-six billion, seven hundred twenty-two million, seven hundred ninety thousand, four hundred fifty-seven".