131778737141681 has 32 divisors (see below), whose sum is σ = 155895488324352. Its totient is φ = 109042974167040.

The previous prime is 131778737141671. The next prime is 131778737141693. The reversal of 131778737141681 is 186141737877131.

It is a cyclic number.

It is not a de Polignac number, because 131778737141681 - 2²⁶ = 131778670032817 is a prime.

It is a super-2 number, since 2×131778737141681² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131778737141621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158741570 + ... + 159569556.

It is an arithmetic number, because the mean of its divisors is an integer number (4871734010136).

Almost surely, 2^{131778737141681} is an apocalyptic number.

It is an amenable number.

131778737141681 is a deficient number, since it is larger than the sum of its proper divisors (24116751182671).

131778737141681 is an equidigital number, since it uses as much as digits as its factorization.

131778737141681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833849.

The product of its digits is 33191424, while the sum is 65.

The spelling of 131778737141681 in words is "one hundred thirty-one trillion, seven hundred seventy-eight billion, seven hundred thirty-seven million, one hundred forty-one thousand, six hundred eighty-one".