55156611501 has 20 divisors (see below), whose sum is σ = 82407001600. Its totient is φ = 36765470376.

The previous prime is 55156611479. The next prime is 55156611511. The reversal of 55156611501 is 10511665155.

It is a happy number.

55156611501 is a `hidden beast` number, since 551 + 56 + 6 + 1 + 1 + 50 + 1 = 666.

It is not a de Polignac number, because 55156611501 - 2⁶ = 55156611437 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 (55156611511) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 521790 + ... + 618528.

It is an arithmetic number, because the mean of its divisors is an integer number (4120350080).

Almost surely, 2^55156611501 is an apocalyptic number.

It is an amenable number.

55156611501 is a deficient number, since it is larger than the sum of its proper divisors (27250390099).

55156611501 is an equidigital number, since it uses as much as digits as its factorization.

55156611501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103790 (or 103781 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 55156611501 in words is "fifty-five billion, one hundred fifty-six million, six hundred eleven thousand, five hundred one".