66151561115651 has 8 divisors (see below), whose sum is σ = 72165860655600. Its totient is φ = 60137348451840.

The previous prime is 66151561115569. The next prime is 66151561115659. The reversal of 66151561115651 is 15651116515166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66151561115651 - 2²² = 66151556921347 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 66151561115651.

It is not an unprimeable number, because it can be changed into a prime (66151561115659) 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 7 ways as a sum of consecutive naturals, for example, 20121806 + ... + 23177363.

It is an arithmetic number, because the mean of its divisors is an integer number (9020732581950).

Almost surely, 2^{66151561115651} is an apocalyptic number.

66151561115651 is a deficient number, since it is larger than the sum of its proper divisors (6014299539949).

66151561115651 is a wasteful number, since it uses less digits than its factorization.

66151561115651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43438069.

The product of its digits is 810000, while the sum is 50.

The spelling of 66151561115651 in words is "sixty-six trillion, one hundred fifty-one billion, five hundred sixty-one million, one hundred fifteen thousand, six hundred fifty-one".