660567655551 has 16 divisors (see below), whose sum is σ = 911158243200. Its totient is φ = 425178767328.

The previous prime is 660567655549. The next prime is 660567655567. The reversal of 660567655551 is 155556765066.

It is a happy number.

It is not a de Polignac number, because 660567655551 - 2¹ = 660567655549 is a prime.

It is a super-2 number, since 2×660567655551² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 660567655491 and 660567655500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660567655151) 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, 2906520 + ... + 3125538.

It is an arithmetic number, because the mean of its divisors is an integer number (56947390200).

Almost surely, 2^660567655551 is an apocalyptic number.

660567655551 is a deficient number, since it is larger than the sum of its proper divisors (250590587649).

660567655551 is a wasteful number, since it uses less digits than its factorization.

660567655551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253718.

The product of its (nonzero) digits is 28350000, while the sum is 57.

The spelling of 660567655551 in words is "six hundred sixty billion, five hundred sixty-seven million, six hundred fifty-five thousand, five hundred fifty-one".