2131377645840 has 40 divisors (see below), whose sum is σ = 6607270702848. Its totient is φ = 568367372160.

The previous prime is 2131377645791. The next prime is 2131377645841. The reversal of 2131377645840 is 485467731312.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (2131377645841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4440369856 + ... + 4440370335.

Almost surely, 2^{2131377645840} is an apocalyptic number.

2131377645840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131377645840 is an abundant number, since it is smaller than the sum of its proper divisors (4475893057008).

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

2131377645840 is a wasteful number, since it uses less digits than its factorization.

2131377645840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8880740207 (or 8880740201 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 2131377645840 in words is "two trillion, one hundred thirty-one billion, three hundred seventy-seven million, six hundred forty-five thousand, eight hundred forty".