61546665664 has 56 divisors (see below), whose sum is σ = 137828883600. Its totient is φ = 27011066880.

The previous prime is 61546665647. The next prime is 61546665709. The reversal of 61546665664 is 46656664516.

61546665664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1486899 + ... + 1527730.

Almost surely, 2^61546665664 is an apocalyptic number.

61546665664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61546665664 is an abundant number, since it is smaller than the sum of its proper divisors (76282217936).

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

61546665664 is a wasteful number, since it uses less digits than its factorization.

61546665664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014681 (or 3014671 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 55.

The spelling of 61546665664 in words is "sixty-one billion, five hundred forty-six million, six hundred sixty-five thousand, six hundred sixty-four".