61516775 has 12 divisors (see below), whose sum is σ = 80296200. Its totient is φ = 46622880.

The previous prime is 61516771. The next prime is 61516799. The reversal of 61516775 is 57761516.

It is not a de Polignac number, because 61516775 - 2² = 61516771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61516771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64280 + ... + 65229.

It is an arithmetic number, because the mean of its divisors is an integer number (6691350).

Almost surely, 2^61516775 is an apocalyptic number.

61516775 is a deficient number, since it is larger than the sum of its proper divisors (18779425).

61516775 is a wasteful number, since it uses less digits than its factorization.

61516775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129538 (or 129533 counting only the distinct ones).

The product of its digits is 44100, while the sum is 38.

The square root of 61516775 is about 7843.2630326925. The cubic root of 61516775 is about 394.7582240971.

The spelling of 61516775 in words is "sixty-one million, five hundred sixteen thousand, seven hundred seventy-five".