66251055066 has 16 divisors (see below), whose sum is σ = 151430983104. Its totient is φ = 18928872864.

The previous prime is 66251055061. The next prime is 66251055067. The reversal of 66251055066 is 66055015266.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1577406073 = 66251055066 / (6 + 6 + 2 + 5 + 1 + 0 + 5 + 5 + 0 + 6 + 6).

It is not an unprimeable number, because it can be changed into a prime (66251055061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 788702995 + ... + 788703078.

It is an arithmetic number, because the mean of its divisors is an integer number (9464436444).

Almost surely, 2^66251055066 is an apocalyptic number.

66251055066 is an abundant number, since it is smaller than the sum of its proper divisors (85179928038).

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

66251055066 is a wasteful number, since it uses less digits than its factorization.

66251055066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577406085.

The product of its (nonzero) digits is 324000, while the sum is 42.

The spelling of 66251055066 in words is "sixty-six billion, two hundred fifty-one million, fifty-five thousand, sixty-six".