213656656 has 10 divisors (see below), whose sum is σ = 413959802. Its totient is φ = 106828320.

The previous prime is 213656633. The next prime is 213656657. The reversal of 213656656 is 656656312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 141134400 + 72522256 = 11880^2 + 8516^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213656657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6676755 + ... + 6676786.

Almost surely, 2^213656656 is an apocalyptic number.

It is an amenable number.

213656656 is a deficient number, since it is larger than the sum of its proper divisors (200303146).

213656656 is a wasteful number, since it uses less digits than its factorization.

213656656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13353549 (or 13353543 counting only the distinct ones).

The product of its digits is 194400, while the sum is 40.

The square root of 213656656 is about 14616.9988711774. The cubic root of 213656656 is about 597.8223429486.

The spelling of 213656656 in words is "two hundred thirteen million, six hundred fifty-six thousand, six hundred fifty-six".