55521156613 has 64 divisors (see below), whose sum is σ = 67060224000. Its totient is φ = 45447367680.

The previous prime is 55521156571. The next prime is 55521156617. The reversal of 55521156613 is 31665112555.

It is a happy number.

55521156613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-55521156613 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 (55521156617) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 132508518 + ... + 132508936.

It is an arithmetic number, because the mean of its divisors is an integer number (1047816000).

Almost surely, 2^55521156613 is an apocalyptic number.

It is an amenable number.

55521156613 is a deficient number, since it is larger than the sum of its proper divisors (11539067387).

55521156613 is a wasteful number, since it uses less digits than its factorization.

55521156613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802.

The product of its digits is 135000, while the sum is 40.

The spelling of 55521156613 in words is "fifty-five billion, five hundred twenty-one million, one hundred fifty-six thousand, six hundred thirteen".