66251066160 has 80 divisors (see below), whose sum is σ = 205611554304. Its totient is φ = 17646886656.

The previous prime is 66251066153. The next prime is 66251066171. The reversal of 66251066160 is 6166015266.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55609 + ... + 368231.

Almost surely, 2^66251066160 is an apocalyptic number.

66251066160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66251066160 is an abundant number, since it is smaller than the sum of its proper divisors (139360488144).

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

66251066160 is a wasteful number, since it uses less digits than its factorization.

66251066160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313522 (or 313516 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 66251066160 in words is "sixty-six billion, two hundred fifty-one million, sixty-six thousand, one hundred sixty".