2131377645844 has 12 divisors (see below), whose sum is σ = 3729966674868. Its totient is φ = 1065672881600.

The previous prime is 2131377645841. The next prime is 2131377645847. The reversal of 2131377645844 is 4485467731312.

It is an interprime number because it is at equal distance from previous prime (2131377645841) and next prime (2131377645847).

It can be written as a sum of positive squares in 2 ways, for example, as 1523772985744 + 607604660100 = 1234412^2 + 779490^2 .

It is a super-2 number, since 2×2131377645844² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3681937 + ... + 4221304.

It is an arithmetic number, because the mean of its divisors is an integer number (310830556239).

Almost surely, 2^{2131377645844} is an apocalyptic number.

It is an amenable number.

2131377645844 is a deficient number, since it is larger than the sum of its proper divisors (1598589029024).

2131377645844 is a wasteful number, since it uses less digits than its factorization.

2131377645844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7970666 (or 7970664 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 55.

The spelling of 2131377645844 in words is "two trillion, one hundred thirty-one billion, three hundred seventy-seven million, six hundred forty-five thousand, eight hundred forty-four".