660521151 has 48 divisors (see below), whose sum is σ = 1012375936. Its totient is φ = 414445248.

The previous prime is 660521131. The next prime is 660521159. The reversal of 660521151 is 151125066.

It is a happy number.

660521151 is a `hidden beast` number, since 6 + 605 + 2 + 1 + 1 + 51 = 666.

It is not a de Polignac number, because 660521151 - 2⁶ = 660521087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660521159) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2333856 + ... + 2334138.

Almost surely, 2^660521151 is an apocalyptic number.

660521151 is a deficient number, since it is larger than the sum of its proper divisors (351854785).

660521151 is a wasteful number, since it uses less digits than its factorization.

660521151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 660521151 is about 25700.6060434380. The cubic root of 660521151 is about 870.8878728100.

The spelling of 660521151 in words is "six hundred sixty million, five hundred twenty-one thousand, one hundred fifty-one".