131781785440240 has 80 divisors (see below), whose sum is σ = 330673977260928. Its totient is φ = 48552797196288.

The previous prime is 131781785440229. The next prime is 131781785440259. The reversal of 131781785440240 is 42044587187131.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×131781785440240² (a number of 29 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 15 ways as a sum of consecutive naturals, for example, 136357849 + ... + 137320888.

Almost surely, 2^{131781785440240} is an apocalyptic number.

131781785440240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131781785440240 is an abundant number, since it is smaller than the sum of its proper divisors (198892191820688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131781785440240 is a wasteful number, since it uses less digits than its factorization.

131781785440240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273679226 (or 273679220 counting only the distinct ones).

The product of its (nonzero) digits is 6021120, while the sum is 55.

The spelling of 131781785440240 in words is "one hundred thirty-one trillion, seven hundred eighty-one billion, seven hundred eighty-five million, four hundred forty thousand, two hundred forty".