61610550661 has 8 divisors (see below), whose sum is σ = 67222388448. Its totient is φ = 56000526000.

The previous prime is 61610550601. The next prime is 61610550667. The reversal of 61610550661 is 16605501616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61610550661 - 2²⁷ = 61476332933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61610550661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61610550667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381735 + ... + 518596.

It is an arithmetic number, because the mean of its divisors is an integer number (8402798556).

Almost surely, 2^61610550661 is an apocalyptic number.

It is an amenable number.

61610550661 is a deficient number, since it is larger than the sum of its proper divisors (5611837787).

61610550661 is a wasteful number, since it uses less digits than its factorization.

61610550661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906563.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 61610550661 in words is "sixty-one billion, six hundred ten million, five hundred fifty thousand, six hundred sixty-one".