2156617764 has 48 divisors (see below), whose sum is σ = 6389980800. Its totient is φ = 616176288.

The previous prime is 2156617763. The next prime is 2156617789. The reversal of 2156617764 is 4677166512.

2156617764 is a `hidden beast` number, since 2 + 1 + 566 + 17 + 76 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (2156617763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1425579 + ... + 1427090.

It is an arithmetic number, because the mean of its divisors is an integer number (133124600).

Almost surely, 2^2156617764 is an apocalyptic number.

It is an amenable number.

2156617764 is an abundant number, since it is smaller than the sum of its proper divisors (4233363036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156617764 is a wasteful number, since it uses less digits than its factorization.

2156617764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2852689 (or 2852681 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 2156617764 is about 46439.3988333182. The cubic root of 2156617764 is about 1291.9857572387.

The spelling of 2156617764 in words is "two billion, one hundred fifty-six million, six hundred seventeen thousand, seven hundred sixty-four".