156991484633 has 4 divisors (see below), whose sum is σ = 157245928500. Its totient is φ = 156737040768.

The previous prime is 156991484603. The next prime is 156991484651. The reversal of 156991484633 is 336484199651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 336484199651 = 31 ⋅10854329021.

It can be written as a sum of positive squares in 2 ways, for example, as 32476364944 + 124515119689 = 180212^2 + 352867^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156991484633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156991484603) 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, 127221008 + ... + 127222241.

It is an arithmetic number, because the mean of its divisors is an integer number (39311482125).

Almost surely, 2^156991484633 is an apocalyptic number.

It is an amenable number.

156991484633 is a deficient number, since it is larger than the sum of its proper divisors (254443867).

156991484633 is an equidigital number, since it uses as much as digits as its factorization.

156991484633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254443866.

The product of its digits is 16796160, while the sum is 59.

The spelling of 156991484633 in words is "one hundred fifty-six billion, nine hundred ninety-one million, four hundred eighty-four thousand, six hundred thirty-three".