660990457512 has 1024 divisors, whose sum is σ = 2532556800000. Its totient is φ = 154457487360.

The previous prime is 660990457507. The next prime is 660990457559. The reversal of 660990457512 is 215754099066.

660990457512 is a `hidden beast` number, since 6 + 60 + 9 + 9 + 0 + 4 + 575 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 1446368388 + ... + 1446368844.

It is an arithmetic number, because the mean of its divisors is an integer number (2473200000).

Almost surely, 2^660990457512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660990457512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1266278400000).

660990457512 is an abundant number, since it is smaller than the sum of its proper divisors (1871566342488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660990457512 is a wasteful number, since it uses less digits than its factorization.

660990457512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731 (or 721 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 54.

The spelling of 660990457512 in words is "six hundred sixty billion, nine hundred ninety million, four hundred fifty-seven thousand, five hundred twelve".