40645604765 has 4 divisors (see below), whose sum is σ = 48774725724. Its totient is φ = 32516483808.

The previous prime is 40645604749. The next prime is 40645604767. The reversal of 40645604765 is 56740654604.

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 6039932089 + 34605672676 = 77717^2 + 186026^2 .

It is a cyclic number.

It is not a de Polignac number, because 40645604765 - 2⁴ = 40645604749 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 (40645604767) 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, 4064560472 + ... + 4064560481.

It is an arithmetic number, because the mean of its divisors is an integer number (12193681431).

Almost surely, 2^40645604765 is an apocalyptic number.

It is an amenable number.

40645604765 is a deficient number, since it is larger than the sum of its proper divisors (8129120959).

40645604765 is an equidigital number, since it uses as much as digits as its factorization.

40645604765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8129120958.

The product of its (nonzero) digits is 2419200, while the sum is 47.

The spelling of 40645604765 in words is "forty billion, six hundred forty-five million, six hundred four thousand, seven hundred sixty-five".