1881560161540 has 12 divisors (see below), whose sum is σ = 3951276339276. Its totient is φ = 752624064608.

The previous prime is 1881560161499. The next prime is 1881560161651. The reversal of 1881560161540 is 451610651881.

It can be written as a sum of positive squares in 2 ways, for example, as 204260610304 + 1677299551236 = 451952^2 + 1295106^2 .

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, 47039004019 + ... + 47039004058.

It is an arithmetic number, because the mean of its divisors is an integer number (329273028273).

Almost surely, 2^{1881560161540} is an apocalyptic number.

1881560161540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1881560161540 is an abundant number, since it is smaller than the sum of its proper divisors (2069716177736).

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

1881560161540 is a wasteful number, since it uses less digits than its factorization.

1881560161540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94078008086 (or 94078008084 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 46.

The spelling of 1881560161540 in words is "one trillion, eight hundred eighty-one billion, five hundred sixty million, one hundred sixty-one thousand, five hundred forty".