866661410 has 16 divisors (see below), whose sum is σ = 1573797816. Its totient is φ = 343596288.

The previous prime is 866661407. The next prime is 866661437. The reversal of 866661410 is 14166668.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 476243329 + 390418081 = 21823^2 + 19759^2 .

It is a super-2 number, since 2×866661410² = 1502203999166376200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382349 + ... + 384608.

Almost surely, 2^866661410 is an apocalyptic number.

866661410 is a deficient number, since it is larger than the sum of its proper divisors (707136406).

866661410 is a wasteful number, since it uses less digits than its factorization.

866661410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767077.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 866661410 is about 29439.1136075800. The cubic root of 866661410 is about 953.4175743719.

The spelling of 866661410 in words is "eight hundred sixty-six million, six hundred sixty-one thousand, four hundred ten".