1656583961 has 4 divisors (see below), whose sum is σ = 1665838800. Its totient is φ = 1647329124.

The previous prime is 1656583931. The next prime is 1656583979. The reversal of 1656583961 is 1693856561.

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 not a de Polignac number, because 1656583961 - 2¹⁰ = 1656582937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1656583931) 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, 4627151 + ... + 4627508.

It is an arithmetic number, because the mean of its divisors is an integer number (416459700).

Almost surely, 2^1656583961 is an apocalyptic number.

It is an amenable number.

1656583961 is a deficient number, since it is larger than the sum of its proper divisors (9254839).

1656583961 is an equidigital number, since it uses as much as digits as its factorization.

1656583961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9254838.

The product of its digits is 1166400, while the sum is 50.

The square root of 1656583961 is about 40701.1542956708. The cubic root of 1656583961 is about 1183.2353900465.

The spelling of 1656583961 in words is "one billion, six hundred fifty-six million, five hundred eighty-three thousand, nine hundred sixty-one".