66102028292639 has 4 divisors (see below), whose sum is σ = 66102048425424. Its totient is φ = 66102008159856.

The previous prime is 66102028292591. The next prime is 66102028292653. The reversal of 66102028292639 is 93629282020166.

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 66102028292639 - 2⁸ = 66102028292383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66102028292239) 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, 3870062 + ... + 12131835.

It is an arithmetic number, because the mean of its divisors is an integer number (16525512106356).

Almost surely, 2^{66102028292639} is an apocalyptic number.

66102028292639 is a deficient number, since it is larger than the sum of its proper divisors (20132785).

66102028292639 is a wasteful number, since it uses less digits than its factorization.

66102028292639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20132784.

The product of its (nonzero) digits is 6718464, while the sum is 56.

The spelling of 66102028292639 in words is "sixty-six trillion, one hundred two billion, twenty-eight million, two hundred ninety-two thousand, six hundred thirty-nine".