61660860775 has 24 divisors (see below), whose sum is σ = 79925043200. Its totient is φ = 47133122400.

The previous prime is 61660860773. The next prime is 61660860809. The reversal of 61660860775 is 57706806616.

61660860775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61660860775 - 2¹ = 61660860773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660860773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 442335 + ... + 564784.

Almost surely, 2^61660860775 is an apocalyptic number.

61660860775 is a deficient number, since it is larger than the sum of its proper divisors (18264182425).

61660860775 is a wasteful number, since it uses less digits than its factorization.

61660860775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007239 (or 1007234 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 61660860775 in words is "sixty-one billion, six hundred sixty million, eight hundred sixty thousand, seven hundred seventy-five".