2151656564 has 6 divisors (see below), whose sum is σ = 3765398994. Its totient is φ = 1075828280.

The previous prime is 2151656543. The next prime is 2151656567. The reversal of 2151656564 is 4656561512.

It can be written as a sum of positive squares in only one way, i.e., 1148667664 + 1002988900 = 33892^2 + 31670^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151656567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268957067 + ... + 268957074.

It is an arithmetic number, because the mean of its divisors is an integer number (627566499).

Almost surely, 2^2151656564 is an apocalyptic number.

It is an amenable number.

2151656564 is a deficient number, since it is larger than the sum of its proper divisors (1613742430).

2151656564 is a wasteful number, since it uses less digits than its factorization.

2151656564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537914145 (or 537914143 counting only the distinct ones).

The product of its digits is 216000, while the sum is 41.

The square root of 2151656564 is about 46385.9522269404. The cubic root of 2151656564 is about 1290.9942786238.

The spelling of 2151656564 in words is "two billion, one hundred fifty-one million, six hundred fifty-six thousand, five hundred sixty-four".