45138918721 has 16 divisors (see below), whose sum is σ = 52343020800. Its totient is φ = 38551027968.

The previous prime is 45138918719. The next prime is 45138918733. The reversal of 45138918721 is 12781983154.

It is a cyclic number.

It is not a de Polignac number, because 45138918721 - 2¹ = 45138918719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45138918751) 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 15 ways as a sum of consecutive naturals, for example, 1717881 + ... + 1743958.

It is an arithmetic number, because the mean of its divisors is an integer number (3271438800).

Almost surely, 2^45138918721 is an apocalyptic number.

It is an amenable number.

45138918721 is a deficient number, since it is larger than the sum of its proper divisors (7204102079).

45138918721 is a wasteful number, since it uses less digits than its factorization.

45138918721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3461928.

The product of its digits is 483840, while the sum is 49.

The spelling of 45138918721 in words is "forty-five billion, one hundred thirty-eight million, nine hundred eighteen thousand, seven hundred twenty-one".