620561656506 has 16 divisors (see below), whose sum is σ = 1353952705248. Its totient is φ = 188048986800.

The previous prime is 620561656489. The next prime is 620561656513. The reversal of 620561656506 is 605656165026.

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, 4701224605 + ... + 4701224736.

It is an arithmetic number, because the mean of its divisors is an integer number (84622044078).

Almost surely, 2^620561656506 is an apocalyptic number.

620561656506 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

620561656506 is an abundant number, since it is smaller than the sum of its proper divisors (733391048742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

620561656506 is a wasteful number, since it uses less digits than its factorization.

620561656506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9402449357.

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 620561656506 in words is "six hundred twenty billion, five hundred sixty-one million, six hundred fifty-six thousand, five hundred six".