620662661 has 4 divisors (see below), whose sum is σ = 625128000. Its totient is φ = 616197324.

The previous prime is 620662597. The next prime is 620662667. The reversal of 620662661 is 166266026.

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 620662661 - 2⁶ = 620662597 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 (620662667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2232461 + ... + 2232738.

It is an arithmetic number, because the mean of its divisors is an integer number (156282000).

Almost surely, 2^620662661 is an apocalyptic number.

It is an amenable number.

620662661 is a deficient number, since it is larger than the sum of its proper divisors (4465339).

620662661 is a wasteful number, since it uses less digits than its factorization.

620662661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4465338.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 620662661 is about 24913.1021954312. The cubic root of 620662661 is about 853.0055817159.

The spelling of 620662661 in words is "six hundred twenty million, six hundred sixty-two thousand, six hundred sixty-one".