66251055065 has 32 divisors (see below), whose sum is σ = 94041319680. Its totient is φ = 44333726976.

The previous prime is 66251055061. The next prime is 66251055067. The reversal of 66251055065 is 56055015266.

It is a cyclic number.

It is not a de Polignac number, because 66251055065 - 2² = 66251055061 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 1137782 + ... + 1194591.

It is an arithmetic number, because the mean of its divisors is an integer number (2938791240).

Almost surely, 2^66251055065 is an apocalyptic number.

66251055065 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66251055065 is a deficient number, since it is larger than the sum of its proper divisors (27790264615).

66251055065 is a wasteful number, since it uses less digits than its factorization.

66251055065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332433.

The product of its (nonzero) digits is 270000, while the sum is 41.

The spelling of 66251055065 in words is "sixty-six billion, two hundred fifty-one million, fifty-five thousand, sixty-five".