157779297591 has 16 divisors (see below), whose sum is σ = 222455159808. Its totient is φ = 99310334400.

The previous prime is 157779297503. The next prime is 157779297629. The reversal of 157779297591 is 195792977751.

It is not a de Polignac number, because 157779297591 - 2²⁷ = 157645079863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157779287591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20685841 + ... + 20693466.

It is an arithmetic number, because the mean of its divisors is an integer number (13903447488).

Almost surely, 2^157779297591 is an apocalyptic number.

157779297591 is a deficient number, since it is larger than the sum of its proper divisors (64675862217).

157779297591 is a wasteful number, since it uses less digits than its factorization.

157779297591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41379382.

The product of its digits is 87516450, while the sum is 69.

The spelling of 157779297591 in words is "one hundred fifty-seven billion, seven hundred seventy-nine million, two hundred ninety-seven thousand, five hundred ninety-one".