66369701391 has 16 divisors (see below), whose sum is σ = 101410366464. Its totient is φ = 37822199904.

The previous prime is 66369701369. The next prime is 66369701407. The reversal of 66369701391 is 19310796366.

It is not a de Polignac number, because 66369701391 - 2⁷ = 66369701263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66369701291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4298100 + ... + 4313513.

It is an arithmetic number, because the mean of its divisors is an integer number (6338147904).

Almost surely, 2^66369701391 is an apocalyptic number.

66369701391 is a deficient number, since it is larger than the sum of its proper divisors (35040665073).

66369701391 is a wasteful number, since it uses less digits than its factorization.

66369701391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8611990.

The product of its (nonzero) digits is 1102248, while the sum is 51.

The spelling of 66369701391 in words is "sixty-six billion, three hundred sixty-nine million, seven hundred one thousand, three hundred ninety-one".