61616613 has 4 divisors (see below), whose sum is σ = 82155488. Its totient is φ = 41077740.

The previous prime is 61616587. The next prime is 61616629. The reversal of 61616613 is 31661616.

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 not a de Polignac number, because 61616613 - 2⁹ = 61616101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61616663) 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, 10269433 + ... + 10269438.

It is an arithmetic number, because the mean of its divisors is an integer number (20538872).

Almost surely, 2^61616613 is an apocalyptic number.

It is an amenable number.

61616613 is a deficient number, since it is larger than the sum of its proper divisors (20538875).

61616613 is a wasteful number, since it uses less digits than its factorization.

61616613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20538874.

The product of its digits is 3888, while the sum is 30.

The square root of 61616613 is about 7849.6250228912. The cubic root of 61616613 is about 394.9716649012.

The spelling of 61616613 in words is "sixty-one million, six hundred sixteen thousand, six hundred thirteen".