40685745655 has 4 divisors (see below), whose sum is σ = 48822894792. Its totient is φ = 32548596520.

The previous prime is 40685745647. The next prime is 40685745671. The reversal of 40685745655 is 55654758604.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 40685745655 - 2³ = 40685745647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40685745596 and 40685745605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4068574561 + ... + 4068574570.

It is an arithmetic number, because the mean of its divisors is an integer number (12205723698).

Almost surely, 2^40685745655 is an apocalyptic number.

40685745655 is a deficient number, since it is larger than the sum of its proper divisors (8137149137).

40685745655 is an equidigital number, since it uses as much as digits as its factorization.

40685745655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8137149136.

The product of its (nonzero) digits is 20160000, while the sum is 55.

The spelling of 40685745655 in words is "forty billion, six hundred eighty-five million, seven hundred forty-five thousand, six hundred fifty-five".