66001500661051 has 4 divisors (see below), whose sum is σ = 66505328910504. Its totient is φ = 65497672411600.

The previous prime is 66001500661039. The next prime is 66001500661079. The reversal of 66001500661051 is 15016600510066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66001500661051 - 2²¹ = 66001498563899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66001500661051.

It is not an unprimeable number, because it can be changed into a prime (66001500662051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251914124530 + ... + 251914124791.

It is an arithmetic number, because the mean of its divisors is an integer number (16626332227626).

Almost surely, 2^{66001500661051} is an apocalyptic number.

66001500661051 is a deficient number, since it is larger than the sum of its proper divisors (503828249453).

66001500661051 is a wasteful number, since it uses less digits than its factorization.

66001500661051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503828249452.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 66001500661051 in words is "sixty-six trillion, one billion, five hundred million, six hundred sixty-one thousand, fifty-one".