621163972207 has 4 divisors (see below), whose sum is σ = 621187212240. Its totient is φ = 621140732176.

The previous prime is 621163972181. The next prime is 621163972237. The reversal of 621163972207 is 702279361126.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 621163972207 - 2²³ = 621155583599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621163972237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11579878 + ... + 11633395.

It is an arithmetic number, because the mean of its divisors is an integer number (155296803060).

Almost surely, 2^621163972207 is an apocalyptic number.

621163972207 is a deficient number, since it is larger than the sum of its proper divisors (23240033).

621163972207 is a wasteful number, since it uses less digits than its factorization.

621163972207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23240032.

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 621163972207 in words is "six hundred twenty-one billion, one hundred sixty-three million, nine hundred seventy-two thousand, two hundred seven".