660251601 has 16 divisors (see below), whose sum is σ = 982252800. Its totient is φ = 438321744.

The previous prime is 660251591. The next prime is 660251611. The reversal of 660251601 is 106152066.

It is a happy number.

660251601 is a `hidden beast` number, since 6 + 6 + 0 + 2 + 51 + 601 = 666.

It is an interprime number because it is at equal distance from previous prime (660251591) and next prime (660251611).

It is not a de Polignac number, because 660251601 - 2¹⁵ = 660218833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (660251611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44706 + ... + 57611.

It is an arithmetic number, because the mean of its divisors is an integer number (61390800).

Almost surely, 2^660251601 is an apocalyptic number.

It is an amenable number.

660251601 is a deficient number, since it is larger than the sum of its proper divisors (322001199).

660251601 is a wasteful number, since it uses less digits than its factorization.

660251601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102565 (or 102559 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 660251601 is about 25695.3614685608. The cubic root of 660251601 is about 870.7693907269.

The spelling of 660251601 in words is "six hundred sixty million, two hundred fifty-one thousand, six hundred one".