55620235621 has 4 divisors (see below), whose sum is σ = 55621405152. Its totient is φ = 55619066092.

The previous prime is 55620235591. The next prime is 55620235661. The reversal of 55620235621 is 12653202655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55620235621 - 2⁷ = 55620235493 is a prime.

It is a super-2 number, since 2×55620235621² (a number of 22 digits) 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 (55620235661) 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, 510265 + ... + 609598.

It is an arithmetic number, because the mean of its divisors is an integer number (13905351288).

Almost surely, 2^55620235621 is an apocalyptic number.

It is an amenable number.

55620235621 is a deficient number, since it is larger than the sum of its proper divisors (1169531).

55620235621 is a wasteful number, since it uses less digits than its factorization.

55620235621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169530.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 55620235621 in words is "fifty-five billion, six hundred twenty million, two hundred thirty-five thousand, six hundred twenty-one".