66381277695 has 16 divisors (see below), whose sum is σ = 106213686912. Its totient is φ = 35402133920.

The previous prime is 66381277679. The next prime is 66381277747. The reversal of 66381277695 is 59677218366.

It is not a de Polignac number, because 66381277695 - 2⁴ = 66381277679 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 534364 + ... + 646766.

It is an arithmetic number, because the mean of its divisors is an integer number (6638355432).

Almost surely, 2^66381277695 is an apocalyptic number.

66381277695 is a deficient number, since it is larger than the sum of its proper divisors (39832409217).

66381277695 is a wasteful number, since it uses less digits than its factorization.

66381277695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151782.

The product of its digits is 22861440, while the sum is 60.

The spelling of 66381277695 in words is "sixty-six billion, three hundred eighty-one million, two hundred seventy-seven thousand, six hundred ninety-five".