660690465 has 16 divisors (see below), whose sum is σ = 1119287808. Its totient is φ = 331640576.

The previous prime is 660690461. The next prime is 660690473. The reversal of 660690465 is 564096066.

It is a cyclic number.

It is not a de Polignac number, because 660690465 - 2² = 660690461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660690461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1295217 + ... + 1295726.

It is an arithmetic number, because the mean of its divisors is an integer number (69955488).

Almost surely, 2^660690465 is an apocalyptic number.

It is an amenable number.

660690465 is a deficient number, since it is larger than the sum of its proper divisors (458597343).

660690465 is a wasteful number, since it uses less digits than its factorization.

660690465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590968.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 660690465 is about 25703.8998013920. The cubic root of 660690465 is about 870.9622791642.

The spelling of 660690465 in words is "six hundred sixty million, six hundred ninety thousand, four hundred sixty-five".