620868161 has 4 divisors (see below), whose sum is σ = 621323712. Its totient is φ = 620412612.

The previous prime is 620868121. The next prime is 620868179. The reversal of 620868161 is 161868026.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 620868161 - 2⁶ = 620868097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620868121) 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, 225725 + ... + 228458.

It is an arithmetic number, because the mean of its divisors is an integer number (155330928).

Almost surely, 2^620868161 is an apocalyptic number.

It is an amenable number.

620868161 is a deficient number, since it is larger than the sum of its proper divisors (455551).

620868161 is a wasteful number, since it uses less digits than its factorization.

620868161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455550.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 620868161 is about 24917.2261899273. The cubic root of 620868161 is about 853.0997140658.

The spelling of 620868161 in words is "six hundred twenty million, eight hundred sixty-eight thousand, one hundred sixty-one".