61540204764 has 48 divisors (see below), whose sum is σ = 147122680320. Its totient is φ = 20009458560.

The previous prime is 61540204763. The next prime is 61540204769. The reversal of 61540204764 is 46740204516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61540204763) 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, 4755607 + ... + 4768529.

It is an arithmetic number, because the mean of its divisors is an integer number (3065055840).

Almost surely, 2^61540204764 is an apocalyptic number.

It is an amenable number.

61540204764 is an abundant number, since it is smaller than the sum of its proper divisors (85582475556).

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

61540204764 is a wasteful number, since it uses less digits than its factorization.

61540204764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22650 (or 22648 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 61540204764 in words is "sixty-one billion, five hundred forty million, two hundred four thousand, seven hundred sixty-four".