620655065 has 4 divisors (see below), whose sum is σ = 744786084. Its totient is φ = 496524048.

The previous prime is 620655041. The next prime is 620655067. The reversal of 620655065 is 560556026.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560556026 = 2 ⋅280278013.

It can be written as a sum of positive squares in 2 ways, for example, as 124791241 + 495863824 = 11171^2 + 22268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620655065 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620655067) 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, 62065502 + ... + 62065511.

It is an arithmetic number, because the mean of its divisors is an integer number (186196521).

Almost surely, 2^620655065 is an apocalyptic number.

It is an amenable number.

620655065 is a deficient number, since it is larger than the sum of its proper divisors (124131019).

620655065 is a wasteful number, since it uses less digits than its factorization.

620655065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124131018.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 620655065 is about 24912.9497450623. The cubic root of 620655065 is about 853.0021018563.

The spelling of 620655065 in words is "six hundred twenty million, six hundred fifty-five thousand, sixty-five".