136406400665 has 8 divisors (see below), whose sum is σ = 163704457728. Its totient is φ = 109113935920.

The previous prime is 136406400659. The next prime is 136406400673. The reversal of 136406400665 is 566004604631.

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

It is not a de Polignac number, because 136406400665 - 2⁸ = 136406400409 is a prime.

It is a super-2 number, since 2×136406400665² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1344227 + ... + 1442136.

It is an arithmetic number, because the mean of its divisors is an integer number (20463057216).

Almost surely, 2^136406400665 is an apocalyptic number.

It is an amenable number.

136406400665 is a deficient number, since it is larger than the sum of its proper divisors (27298057063).

136406400665 is an equidigital number, since it uses as much as digits as its factorization.

136406400665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2796159.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 136406400665 in words is "one hundred thirty-six billion, four hundred six million, four hundred thousand, six hundred sixty-five".