40395421765 has 4 divisors (see below), whose sum is σ = 48474506124. Its totient is φ = 32316337408.

The previous prime is 40395421753. The next prime is 40395421793. The reversal of 40395421765 is 56712459304.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12738733956 + 27656687809 = 112866^2 + 166303^2 .

It is a cyclic number.

It is not a de Polignac number, because 40395421765 - 2²³ = 40387033157 is a prime.

It is a Duffinian number.

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, 4039542172 + ... + 4039542181.

It is an arithmetic number, because the mean of its divisors is an integer number (12118626531).

Almost surely, 2^40395421765 is an apocalyptic number.

It is an amenable number.

40395421765 is a deficient number, since it is larger than the sum of its proper divisors (8079084359).

40395421765 is an equidigital number, since it uses as much as digits as its factorization.

40395421765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8079084358.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 40395421765 in words is "forty billion, three hundred ninety-five million, four hundred twenty-one thousand, seven hundred sixty-five".