55801623 has 4 divisors (see below), whose sum is σ = 74402168. Its totient is φ = 37201080.

The previous prime is 55801621. The next prime is 55801637. The reversal of 55801623 is 32610855.

55801623 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55801623 - 2¹ = 55801621 is a prime.

It is a super-2 number, since 2×55801623² = 6227642258868258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55801621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9300268 + ... + 9300273.

It is an arithmetic number, because the mean of its divisors is an integer number (18600542).

Almost surely, 2^55801623 is an apocalyptic number.

55801623 is a deficient number, since it is larger than the sum of its proper divisors (18600545).

55801623 is a wasteful number, since it uses less digits than its factorization.

55801623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18600544.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 55801623 is about 7470.0483934175. The cubic root of 55801623 is about 382.1339383034.

The spelling of 55801623 in words is "fifty-five million, eight hundred one thousand, six hundred twenty-three".