66654291415 has 4 divisors (see below), whose sum is σ = 79985149704. Its totient is φ = 53323433128.

The previous prime is 66654291413. The next prime is 66654291437. The reversal of 66654291415 is 51419245666.

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 66654291415 - 2¹ = 66654291413 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66654291413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6665429137 + ... + 6665429146.

It is an arithmetic number, because the mean of its divisors is an integer number (19996287426).

Almost surely, 2^66654291415 is an apocalyptic number.

66654291415 is a deficient number, since it is larger than the sum of its proper divisors (13330858289).

66654291415 is a wasteful number, since it uses less digits than its factorization.

66654291415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13330858288.

The product of its digits is 1555200, while the sum is 49.

The spelling of 66654291415 in words is "sixty-six billion, six hundred fifty-four million, two hundred ninety-one thousand, four hundred fifteen".