66396138351 has 8 divisors (see below), whose sum is σ = 88991683584. Its totient is φ = 44032342680.

The previous prime is 66396138337. The next prime is 66396138371. The reversal of 66396138351 is 15383169366.

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

It is not a de Polignac number, because 66396138351 - 2²⁷ = 66261920623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66396138294 and 66396138303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66396138371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57936721 + ... + 57937866.

It is an arithmetic number, because the mean of its divisors is an integer number (11123960448).

Almost surely, 2^66396138351 is an apocalyptic number.

66396138351 is a deficient number, since it is larger than the sum of its proper divisors (22595545233).

66396138351 is a wasteful number, since it uses less digits than its factorization.

66396138351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115874781.

The product of its digits is 2099520, while the sum is 51.

The spelling of 66396138351 in words is "sixty-six billion, three hundred ninety-six million, one hundred thirty-eight thousand, three hundred fifty-one".