131647785478 has 16 divisors (see below), whose sum is σ = 215550653904. Its totient is φ = 59804623360.

The previous prime is 131647785469. The next prime is 131647785499. The reversal of 131647785478 is 874587746131.

It is a happy number.

It is a super-2 number, since 2×131647785478² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1725775 + ... + 1800442.

It is an arithmetic number, because the mean of its divisors is an integer number (13471915869).

Almost surely, 2^131647785478 is an apocalyptic number.

131647785478 is a deficient number, since it is larger than the sum of its proper divisors (83902868426).

131647785478 is a wasteful number, since it uses less digits than its factorization.

131647785478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3527927.

The product of its digits is 31610880, while the sum is 61.

The spelling of 131647785478 in words is "one hundred thirty-one billion, six hundred forty-seven million, seven hundred eighty-five thousand, four hundred seventy-eight".