866630557 has 16 divisors (see below), whose sum is σ = 963990720. Its totient is φ = 774006912.

The previous prime is 866630537. The next prime is 866630621. The reversal of 866630557 is 755036668.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 866630557 - 2²⁷ = 732412829 is a prime.

It is a super-2 number, since 2×866630557² = 1502097044652260498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866630537) 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, 52569 + ... + 67057.

It is an arithmetic number, because the mean of its divisors is an integer number (60249420).

Almost surely, 2^866630557 is an apocalyptic number.

It is an amenable number.

866630557 is a deficient number, since it is larger than the sum of its proper divisors (97360163).

866630557 is a wasteful number, since it uses less digits than its factorization.

866630557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14652.

The product of its (nonzero) digits is 907200, while the sum is 46.

The square root of 866630557 is about 29438.5895891770. The cubic root of 866630557 is about 953.4062604027.

The spelling of 866630557 in words is "eight hundred sixty-six million, six hundred thirty thousand, five hundred fifty-seven".