118640566397 has 4 divisors (see below), whose sum is σ = 118641344700. Its totient is φ = 118639788096.

The previous prime is 118640566393. The next prime is 118640566411. The reversal of 118640566397 is 793665046811.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 103676916121 + 14963650276 = 321989^2 + 122326^2 .

It is a cyclic number.

It is not a de Polignac number, because 118640566397 - 2² = 118640566393 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 (118640566393) 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, 77078 + ... + 493175.

It is an arithmetic number, because the mean of its divisors is an integer number (29660336175).

Almost surely, 2^118640566397 is an apocalyptic number.

It is an amenable number.

118640566397 is a deficient number, since it is larger than the sum of its proper divisors (778303).

118640566397 is an equidigital number, since it uses as much as digits as its factorization.

118640566397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778302.

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 118640566397 in words is "one hundred eighteen billion, six hundred forty million, five hundred sixty-six thousand, three hundred ninety-seven".