40212520765 has 4 divisors (see below), whose sum is σ = 48255024924. Its totient is φ = 32170016608.

The previous prime is 40212520739. The next prime is 40212520811. The reversal of 40212520765 is 56702521204.

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 8436606201 + 31775914564 = 91851^2 + 178258^2 .

It is a cyclic number.

It is not a de Polignac number, because 40212520765 - 2⁷ = 40212520637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40212520765.

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, 4021252072 + ... + 4021252081.

It is an arithmetic number, because the mean of its divisors is an integer number (12063756231).

Almost surely, 2^40212520765 is an apocalyptic number.

It is an amenable number.

40212520765 is a deficient number, since it is larger than the sum of its proper divisors (8042504159).

40212520765 is an equidigital number, since it uses as much as digits as its factorization.

40212520765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8042504158.

The product of its (nonzero) digits is 33600, while the sum is 34.

The spelling of 40212520765 in words is "forty billion, two hundred twelve million, five hundred twenty thousand, seven hundred sixty-five".