45545043521 has 4 divisors (see below), whose sum is σ = 45546511044. Its totient is φ = 45543576000.

The previous prime is 45545043497. The next prime is 45545043539. The reversal of 45545043521 is 12534054554.

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 13727402896 + 31817640625 = 117164^2 + 178375^2 .

It is a cyclic number.

It is not a de Polignac number, because 45545043521 - 2⁶ = 45545043457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (45545043221) 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, 686180 + ... + 749621.

It is an arithmetic number, because the mean of its divisors is an integer number (11386627761).

Almost surely, 2^45545043521 is an apocalyptic number.

It is an amenable number.

45545043521 is a deficient number, since it is larger than the sum of its proper divisors (1467523).

45545043521 is a wasteful number, since it uses less digits than its factorization.

45545043521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1467522.

The product of its (nonzero) digits is 240000, while the sum is 38.

The spelling of 45545043521 in words is "forty-five billion, five hundred forty-five million, forty-three thousand, five hundred twenty-one".