215680466 has 4 divisors (see below), whose sum is σ = 323520702. Its totient is φ = 107840232.

The previous prime is 215680429. The next prime is 215680469. The reversal of 215680466 is 664086512.

215680466 = 4234² + 4235² + ... + 4245².

215680466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 215238241 + 442225 = 14671^2 + 665^2 .

It is not an unprimeable number, because it can be changed into a prime (215680469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53920115 + ... + 53920118.

Almost surely, 2^215680466 is an apocalyptic number.

215680466 is a deficient number, since it is larger than the sum of its proper divisors (107840236).

215680466 is a wasteful number, since it uses less digits than its factorization.

215680466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107840235.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 215680466 is about 14686.0636659385. The cubic root of 215680466 is about 599.7039891719.

The spelling of 215680466 in words is "two hundred fifteen million, six hundred eighty thousand, four hundred sixty-six".