61556613 has 4 divisors (see below), whose sum is σ = 82075488. Its totient is φ = 41037740.

The previous prime is 61556587. The next prime is 61556617. The reversal of 61556613 is 31665516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61556613 - 2⁵ = 61556581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61556617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10259433 + ... + 10259438.

It is an arithmetic number, because the mean of its divisors is an integer number (20518872).

Almost surely, 2^61556613 is an apocalyptic number.

It is an amenable number.

61556613 is a deficient number, since it is larger than the sum of its proper divisors (20518875).

61556613 is a wasteful number, since it uses less digits than its factorization.

61556613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20518874.

The product of its digits is 16200, while the sum is 33.

The square root of 61556613 is about 7845.8022534346. The cubic root of 61556613 is about 394.8434202872.

The spelling of 61556613 in words is "sixty-one million, five hundred fifty-six thousand, six hundred thirteen".