61560666 has 48 divisors (see below), whose sum is σ = 137050056. Its totient is φ = 19963008.

The previous prime is 61560599. The next prime is 61560701. The reversal of 61560666 is 66606516.

It can be written as a sum of positive squares in 4 ways, for example, as 61544025 + 16641 = 7845^2 + 129^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61560666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164856 + ... + 165228.

Almost surely, 2^61560666 is an apocalyptic number.

61560666 is an abundant number, since it is smaller than the sum of its proper divisors (75489390).

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

61560666 is a wasteful number, since it uses less digits than its factorization.

61560666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 61560666 is about 7846.0605401692. The cubic root of 61560666 is about 394.8520858347.

It can be divided in two parts, 61560 and 666, that added together give a palindrome (62226).

The spelling of 61560666 in words is "sixty-one million, five hundred sixty thousand, six hundred sixty-six".