620056661 has 4 divisors (see below), whose sum is σ = 708636192. Its totient is φ = 531477132.

The previous prime is 620056631. The next prime is 620056669. The reversal of 620056661 is 166650026.

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 a de Polignac number, because none of the positive numbers 2^k-620056661 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 (620056669) 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, 44289755 + ... + 44289768.

It is an arithmetic number, because the mean of its divisors is an integer number (177159048).

Almost surely, 2^620056661 is an apocalyptic number.

It is an amenable number.

620056661 is a deficient number, since it is larger than the sum of its proper divisors (88579531).

620056661 is an equidigital number, since it uses as much as digits as its factorization.

620056661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88579530.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 620056661 is about 24900.9369502435. The cubic root of 620056661 is about 852.7278733123.

The spelling of 620056661 in words is "six hundred twenty million, fifty-six thousand, six hundred sixty-one".