621553055 has 8 divisors (see below), whose sum is σ = 747159792. Its totient is φ = 496378368.

The previous prime is 621553021. The next prime is 621553087. The reversal of 621553055 is 550355126.

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 621553055 - 2⁶ = 621552991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104837 + ... + 110606.

It is an arithmetic number, because the mean of its divisors is an integer number (93394974).

Almost surely, 2^621553055 is an apocalyptic number.

621553055 is a deficient number, since it is larger than the sum of its proper divisors (125606737).

621553055 is a wasteful number, since it uses less digits than its factorization.

621553055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216025.

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 621553055 is about 24930.9657855447. The cubic root of 621553055 is about 853.4132901187.

The spelling of 621553055 in words is "six hundred twenty-one million, five hundred fifty-three thousand, fifty-five".