945345899521 has 27 divisors (see below), whose sum is σ = 979475641347. Its totient is φ = 912395997600.

The previous prime is 945345899483. The next prime is 945345899551. The reversal of 945345899521 is 125998543549.

The square root of 945345899521 is 972289.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 555300684225 + 390045215296 = 745185^2 + 624536^2 .

It is not a de Polignac number, because 945345899521 - 2²⁷ = 945211681793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (945345899551) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6260568796 + ... + 6260568946.

Almost surely, 2^945345899521 is an apocalyptic number.

945345899521 is the 972289-th square number.

945345899521 is the 486145-th centered octagonal number.

It is an amenable number.

945345899521 is a deficient number, since it is larger than the sum of its proper divisors (34129741826).

945345899521 is an frugal number, since it uses more digits than its factorization.

945345899521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 335 counting only the distinct ones).

The product of its digits is 69984000, while the sum is 64.

Multiplying 945345899521 by its sum of digits (64), we get a square (60502137569344 = 7778312²).

The spelling of 945345899521 in words is "nine hundred forty-five billion, three hundred forty-five million, eight hundred ninety-nine thousand, five hundred twenty-one".