61555606605 has 48 divisors (see below), whose sum is σ = 110967707136. Its totient is φ = 31540440960.

The previous prime is 61555606559. The next prime is 61555606627. The reversal of 61555606605 is 50660655516.

It is not a de Polignac number, because 61555606605 - 2⁷ = 61555606477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142717 + ... + 378786.

It is an arithmetic number, because the mean of its divisors is an integer number (2311827232).

Almost surely, 2^61555606605 is an apocalyptic number.

It is an amenable number.

61555606605 is a deficient number, since it is larger than the sum of its proper divisors (49412100531).

61555606605 is a wasteful number, since it uses less digits than its factorization.

61555606605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521618 (or 521615 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 61555606605 in words is "sixty-one billion, five hundred fifty-five million, six hundred six thousand, six hundred five".