660145651 has 8 divisors (see below), whose sum is σ = 743390208. Its totient is φ = 580773000.

The previous prime is 660145627. The next prime is 660145657. The reversal of 660145651 is 156541066.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660145651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660145657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 967615 + ... + 968296.

It is an arithmetic number, because the mean of its divisors is an integer number (92923776).

Almost surely, 2^660145651 is an apocalyptic number.

660145651 is a deficient number, since it is larger than the sum of its proper divisors (83244557).

660145651 is a wasteful number, since it uses less digits than its factorization.

660145651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935953.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 660145651 is about 25693.2997296961. The cubic root of 660145651 is about 870.7228110331.

The spelling of 660145651 in words is "six hundred sixty million, one hundred forty-five thousand, six hundred fifty-one".