156997820479 has 4 divisors (see below), whose sum is σ = 157044786976. Its totient is φ = 156950853984.

The previous prime is 156997820443. The next prime is 156997820509. The reversal of 156997820479 is 974028799651.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 974028799651 = 1621 ⋅600881431.

It is a cyclic number.

It is not a de Polignac number, because 156997820479 - 2¹³ = 156997812287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156997820779) 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, 23478234 + ... + 23484919.

It is an arithmetic number, because the mean of its divisors is an integer number (39261196744).

Almost surely, 2^156997820479 is an apocalyptic number.

156997820479 is a deficient number, since it is larger than the sum of its proper divisors (46966497).

156997820479 is an equidigital number, since it uses as much as digits as its factorization.

156997820479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46966496.

The product of its (nonzero) digits is 68584320, while the sum is 67.

The spelling of 156997820479 in words is "one hundred fifty-six billion, nine hundred ninety-seven million, eight hundred twenty thousand, four hundred seventy-nine".