621220056555 has 64 divisors (see below), whose sum is σ = 1151548489728. Its totient is φ = 280107504000.

The previous prime is 621220056551. The next prime is 621220056599. The reversal of 621220056555 is 555650022126.

It is not a de Polignac number, because 621220056555 - 2² = 621220056551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621220056551) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2600142 + ... + 2828988.

It is an arithmetic number, because the mean of its divisors is an integer number (17992945152).

Almost surely, 2^621220056555 is an apocalyptic number.

621220056555 is a deficient number, since it is larger than the sum of its proper divisors (530328433173).

621220056555 is a wasteful number, since it uses less digits than its factorization.

621220056555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229216.

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 621220056555 in words is "six hundred twenty-one billion, two hundred twenty million, fifty-six thousand, five hundred fifty-five".