661152705 has 16 divisors (see below), whose sum is σ = 1059480000. Its totient is φ = 352069568.

The previous prime is 661152697. The next prime is 661152719. The reversal of 661152705 is 507251166.

It is a cyclic number.

It is not a de Polignac number, because 661152705 - 2³ = 661152697 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23955 + ... + 43544.

It is an arithmetic number, because the mean of its divisors is an integer number (66217500).

Almost surely, 2^661152705 is an apocalyptic number.

It is an amenable number.

661152705 is a deficient number, since it is larger than the sum of its proper divisors (398327295).

661152705 is a wasteful number, since it uses less digits than its factorization.

661152705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68160.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 661152705 is about 25712.8898609238. The cubic root of 661152705 is about 871.1653494230.

The spelling of 661152705 in words is "six hundred sixty-one million, one hundred fifty-two thousand, seven hundred five".