61613315621 has 8 divisors (see below), whose sum is σ = 72384874464. Its totient is φ = 51703481520.

The previous prime is 61613315591. The next prime is 61613315663. The reversal of 61613315621 is 12651331616.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61613315621 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 (61613315681) 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, 215431031 + ... + 215431316.

It is an arithmetic number, because the mean of its divisors is an integer number (9048109308).

Almost surely, 2^61613315621 is an apocalyptic number.

It is an amenable number.

61613315621 is a deficient number, since it is larger than the sum of its proper divisors (10771558843).

61613315621 is a wasteful number, since it uses less digits than its factorization.

61613315621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430862371.

The product of its digits is 19440, while the sum is 35.

The spelling of 61613315621 in words is "sixty-one billion, six hundred thirteen million, three hundred fifteen thousand, six hundred twenty-one".