2581186871540 has 12 divisors (see below), whose sum is σ = 5420492430276. Its totient is φ = 1032474748608.

The previous prime is 2581186871537. The next prime is 2581186871591. The reversal of 2581186871540 is 451786811852.

It can be written as a sum of positive squares in 2 ways, for example, as 961258671844 + 1619928199696 = 980438^2 + 1272764^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64529671769 + ... + 64529671808.

It is an arithmetic number, because the mean of its divisors is an integer number (451707702523).

Almost surely, 2^{2581186871540} is an apocalyptic number.

2581186871540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2581186871540 is an abundant number, since it is smaller than the sum of its proper divisors (2839305558736).

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

2581186871540 is a wasteful number, since it uses less digits than its factorization.

2581186871540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129059343586 (or 129059343584 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 56.

The spelling of 2581186871540 in words is "two trillion, five hundred eighty-one billion, one hundred eighty-six million, eight hundred seventy-one thousand, five hundred forty".