661166410 has 16 divisors (see below), whose sum is σ = 1219127112. Its totient is φ = 258016000.

The previous prime is 661166381. The next prime is 661166459. The reversal of 661166410 is 14661166.

It can be written as a sum of positive squares in 4 ways, for example, as 246270249 + 414896161 = 15693^2 + 20369^2 .

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, 805891 + ... + 806710.

Almost surely, 2^661166410 is an apocalyptic number.

661166410 is a deficient number, since it is larger than the sum of its proper divisors (557960702).

661166410 is a wasteful number, since it uses less digits than its factorization.

661166410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612649.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 661166410 is about 25713.1563601204. The cubic root of 661166410 is about 871.1713688285.

The spelling of 661166410 in words is "six hundred sixty-one million, one hundred sixty-six thousand, four hundred ten".