45128991321 has 40 divisors (see below), whose sum is σ = 68282727744. Its totient is φ = 29699304480.

The previous prime is 45128991307. The next prime is 45128991329. The reversal of 45128991321 is 12319982154.

45128991321 is a `hidden beast` number, since 45 + 1 + 289 + 9 + 1 + 321 = 666.

It is not a de Polignac number, because 45128991321 - 2¹¹ = 45128989273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (45128991329) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 12509700 + ... + 12513306.

Almost surely, 2^45128991321 is an apocalyptic number.

It is an amenable number.

45128991321 is a deficient number, since it is larger than the sum of its proper divisors (23153736423).

45128991321 is a wasteful number, since it uses less digits than its factorization.

45128991321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5563 (or 5554 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The spelling of 45128991321 in words is "forty-five billion, one hundred twenty-eight million, nine hundred ninety-one thousand, three hundred twenty-one".