61581132140 has 48 divisors (see below), whose sum is σ = 141103275264. Its totient is φ = 22388932800.

The previous prime is 61581132113. The next prime is 61581132143. The reversal of 61581132140 is 4123118516.

It is a junction number, because it is equal to n+sod(n) for n = 61581132097 and 61581132106.

It is not an unprimeable number, because it can be changed into a prime (61581132143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1299137 + ... + 1345703.

It is an arithmetic number, because the mean of its divisors is an integer number (2939651568).

Almost surely, 2^61581132140 is an apocalyptic number.

It is an amenable number.

61581132140 is an abundant number, since it is smaller than the sum of its proper divisors (79522143124).

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

61581132140 is a wasteful number, since it uses less digits than its factorization.

61581132140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52598 (or 52596 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The spelling of 61581132140 in words is "sixty-one billion, five hundred eighty-one million, one hundred thirty-two thousand, one hundred forty".