39647221465 has 4 divisors (see below), whose sum is σ = 47576665764. Its totient is φ = 31717777168.

The previous prime is 39647221429. The next prime is 39647221469. The reversal of 39647221465 is 56412274693.

39647221465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10303874064 + 29343347401 = 101508^2 + 171299^2 .

It is a cyclic number.

It is not a de Polignac number, because 39647221465 - 2¹⁹ = 39646697177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39647221469) 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, 3964722142 + ... + 3964722151.

It is an arithmetic number, because the mean of its divisors is an integer number (11894166441).

Almost surely, 2^39647221465 is an apocalyptic number.

It is an amenable number.

39647221465 is a deficient number, since it is larger than the sum of its proper divisors (7929444299).

39647221465 is an equidigital number, since it uses as much as digits as its factorization.

39647221465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7929444298.

The product of its digits is 2177280, while the sum is 49.

The spelling of 39647221465 in words is "thirty-nine billion, six hundred forty-seven million, two hundred twenty-one thousand, four hundred sixty-five".