55501621 has 16 divisors (see below), whose sum is σ = 66291840. Its totient is φ = 45460800.

The previous prime is 55501597. The next prime is 55501627. The reversal of 55501621 is 12610555.

It is not a de Polignac number, because 55501621 - 2⁷ = 55501493 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 (55501627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19150 + ... + 21856.

It is an arithmetic number, because the mean of its divisors is an integer number (4143240).

Almost surely, 2^55501621 is an apocalyptic number.

It is an amenable number.

55501621 is a deficient number, since it is larger than the sum of its proper divisors (10790219).

55501621 is a wasteful number, since it uses less digits than its factorization.

55501621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2844.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 55501621 is about 7449.9410064778. The cubic root of 55501621 is about 381.4478948962.

The spelling of 55501621 in words is "fifty-five million, five hundred one thousand, six hundred twenty-one".