61516557 has 32 divisors (see below), whose sum is σ = 97090560. Its totient is φ = 38361600.

The previous prime is 61516549. The next prime is 61516571. The reversal of 61516557 is 75561516.

It is not a de Polignac number, because 61516557 - 2³ = 61516549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61516157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102057 + ... + 102657.

It is an arithmetic number, because the mean of its divisors is an integer number (3034080).

Almost surely, 2^61516557 is an apocalyptic number.

It is an amenable number.

61516557 is a deficient number, since it is larger than the sum of its proper divisors (35574003).

61516557 is a wasteful number, since it uses less digits than its factorization.

61516557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850 (or 844 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 61516557 is about 7843.2491354030. The cubic root of 61516557 is about 394.7577577886.

The spelling of 61516557 in words is "sixty-one million, five hundred sixteen thousand, five hundred fifty-seven".