660012012551 has 8 divisors (see below), whose sum is σ = 668879038464. Its totient is φ = 651192278040.

The previous prime is 660012012503. The next prime is 660012012563. The reversal of 660012012551 is 155210210066.

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 not a de Polignac number, because 660012012551 - 2¹⁸ = 660011750407 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 (660012062551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11794751 + ... + 11850576.

It is an arithmetic number, because the mean of its divisors is an integer number (83609879808).

Almost surely, 2^660012012551 is an apocalyptic number.

660012012551 is a deficient number, since it is larger than the sum of its proper divisors (8867025913).

660012012551 is a wasteful number, since it uses less digits than its factorization.

660012012551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23645701.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 660012012551 in words is "six hundred sixty billion, twelve million, twelve thousand, five hundred fifty-one".