55621577 has 8 divisors (see below), whose sum is σ = 60778080. Its totient is φ = 50481760.

The previous prime is 55621561. The next prime is 55621627. The reversal of 55621577 is 77512655.

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

It is a cyclic number.

It is not a de Polignac number, because 55621577 - 2⁴ = 55621561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55621577.

It is not an unprimeable number, because it can be changed into a prime (55621277) 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, 3413 + ... + 11085.

It is an arithmetic number, because the mean of its divisors is an integer number (7597260).

Almost surely, 2^55621577 is an apocalyptic number.

It is an amenable number.

55621577 is a deficient number, since it is larger than the sum of its proper divisors (5156503).

55621577 is a wasteful number, since it uses less digits than its factorization.

55621577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8343.

The product of its digits is 73500, while the sum is 38.

The square root of 55621577 is about 7457.9874631163. The cubic root of 55621577 is about 381.7225057241.

The spelling of 55621577 in words is "fifty-five million, six hundred twenty-one thousand, five hundred seventy-seven".