621072666505 has 16 divisors (see below), whose sum is σ = 816338923920. Its totient is φ = 451505969152.

The previous prime is 621072666373. The next prime is 621072666523. The reversal of 621072666505 is 505666270126.

It can be written as a sum of positive squares in 8 ways, for example, as 18978919696 + 602093746809 = 137764^2 + 775947^2 .

It is not a de Polignac number, because 621072666505 - 2²⁵ = 621039112073 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, 125975764 + ... + 125980693.

It is an arithmetic number, because the mean of its divisors is an integer number (51021182745).

Almost surely, 2^621072666505 is an apocalyptic number.

It is an amenable number.

621072666505 is a deficient number, since it is larger than the sum of its proper divisors (195266257415).

621072666505 is a wasteful number, since it uses less digits than its factorization.

621072666505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251956508.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 621072666505 in words is "six hundred twenty-one billion, seventy-two million, six hundred sixty-six thousand, five hundred five".