45016013621 has 4 divisors (see below), whose sum is σ = 45016867692. Its totient is φ = 45015159552.

The previous prime is 45016013593. The next prime is 45016013639. The reversal of 45016013621 is 12631061054.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12631061054 = 2 ⋅6315530527.

It can be written as a sum of positive squares in 2 ways, for example, as 38468938225 + 6547075396 = 196135^2 + 80914^2 .

It is a cyclic number.

It is not a de Polignac number, because 45016013621 - 2³⁰ = 43942271797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45016016621) 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, 342380 + ... + 455253.

It is an arithmetic number, because the mean of its divisors is an integer number (11254216923).

Almost surely, 2^45016013621 is an apocalyptic number.

It is an amenable number.

45016013621 is a deficient number, since it is larger than the sum of its proper divisors (854071).

45016013621 is an equidigital number, since it uses as much as digits as its factorization.

45016013621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854070.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 45016013621 its reverse (12631061054), we get a palindrome (57647074675).

The spelling of 45016013621 in words is "forty-five billion, sixteen million, thirteen thousand, six hundred twenty-one".