17811680157 has 12 divisors (see below), whose sum is σ = 26423333820. Its totient is φ = 11553522048.

The previous prime is 17811680149. The next prime is 17811680219. The reversal of 17811680157 is 75108611871.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10704178521 + 7107501636 = 103461^2 + 84306^2 .

It is not a de Polignac number, because 17811680157 - 2³ = 17811680149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17811680357) 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 11 ways as a sum of consecutive naturals, for example, 26743932 + ... + 26744597.

It is an arithmetic number, because the mean of its divisors is an integer number (2201944485).

Almost surely, 2^17811680157 is an apocalyptic number.

It is an amenable number.

17811680157 is a deficient number, since it is larger than the sum of its proper divisors (8611653663).

17811680157 is a wasteful number, since it uses less digits than its factorization.

17811680157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53488572 (or 53488569 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 45.

The spelling of 17811680157 in words is "seventeen billion, eight hundred eleven million, six hundred eighty thousand, one hundred fifty-seven".