621606155 has 16 divisors (see below), whose sum is σ = 772826400. Its totient is φ = 479404800.

The previous prime is 621606143. The next prime is 621606187. The reversal of 621606155 is 551606126.

It is not a de Polignac number, because 621606155 - 2⁸ = 621605899 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104255 + ... + 110055.

It is an arithmetic number, because the mean of its divisors is an integer number (48301650).

Almost surely, 2^621606155 is an apocalyptic number.

621606155 is a deficient number, since it is larger than the sum of its proper divisors (151220245).

621606155 is a wasteful number, since it uses less digits than its factorization.

621606155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6574.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 621606155 is about 24932.0307034947. The cubic root of 621606155 is about 853.4375921231.

The spelling of 621606155 in words is "six hundred twenty-one million, six hundred six thousand, one hundred fifty-five".