61516664 has 16 divisors (see below), whose sum is σ = 125829720. Its totient is φ = 27962080.

The previous prime is 61516649. The next prime is 61516667. The reversal of 61516664 is 46661516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61516667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349439 + ... + 349614.

Almost surely, 2^61516664 is an apocalyptic number.

It is an amenable number.

61516664 is an abundant number, since it is smaller than the sum of its proper divisors (64313056).

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

61516664 is a wasteful number, since it uses less digits than its factorization.

61516664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699070 (or 699066 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 61516664 is about 7843.2559565527. The cubic root of 61516664 is about 394.7579866649.

The spelling of 61516664 in words is "sixty-one million, five hundred sixteen thousand, six hundred sixty-four".