66402061280351 has 4 divisors (see below), whose sum is σ = 66841810030704. Its totient is φ = 65962312530000.

The previous prime is 66402061280297. The next prime is 66402061280389. The reversal of 66402061280351 is 15308216020466.

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 66402061280351 - 2²² = 66402057086047 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 (66402061280551) 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, 219874374950 + ... + 219874375251.

It is an arithmetic number, because the mean of its divisors is an integer number (16710452507676).

Almost surely, 2^{66402061280351} is an apocalyptic number.

66402061280351 is a deficient number, since it is larger than the sum of its proper divisors (439748750353).

66402061280351 is a wasteful number, since it uses less digits than its factorization.

66402061280351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439748750352.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 66402061280351 in words is "sixty-six trillion, four hundred two billion, sixty-one million, two hundred eighty thousand, three hundred fifty-one".