66601847655 has 48 divisors (see below), whose sum is σ = 134424463680. Its totient is φ = 29872088064.

The previous prime is 66601847651. The next prime is 66601847659. The reversal of 66601847655 is 55674810666.

It is an interprime number because it is at equal distance from previous prime (66601847651) and next prime (66601847659).

It is not a de Polignac number, because 66601847655 - 2² = 66601847651 is a prime.

It is a super-2 number, since 2×66601847655² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66601847651) 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, 1977970 + ... + 2011359.

It is an arithmetic number, because the mean of its divisors is an integer number (2800509660).

Almost surely, 2^66601847655 is an apocalyptic number.

66601847655 is an abundant number, since it is smaller than the sum of its proper divisors (67822616025).

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

66601847655 is a wasteful number, since it uses less digits than its factorization.

66601847655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3989400 (or 3989397 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 54.

The spelling of 66601847655 in words is "sixty-six billion, six hundred one million, eight hundred forty-seven thousand, six hundred fifty-five".