39540961641 has 4 divisors (see below), whose sum is σ = 52721282192. Its totient is φ = 26360641092.

The previous prime is 39540961639. The next prime is 39540961697. The reversal of 39540961641 is 14616904593.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 39540961641 - 2¹ = 39540961639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39540961631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6590160271 + ... + 6590160276.

It is an arithmetic number, because the mean of its divisors is an integer number (13180320548).

Almost surely, 2^39540961641 is an apocalyptic number.

It is an amenable number.

39540961641 is a deficient number, since it is larger than the sum of its proper divisors (13180320551).

39540961641 is a wasteful number, since it uses less digits than its factorization.

39540961641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13180320550.

The product of its (nonzero) digits is 699840, while the sum is 48.

The spelling of 39540961641 in words is "thirty-nine billion, five hundred forty million, nine hundred sixty-one thousand, six hundred forty-one".