745095249721 has 27 divisors (see below), whose sum is σ = 793906303599. Its totient is φ = 699183090000.

The previous prime is 745095249713. The next prime is 745095249799. The reversal of 745095249721 is 127942590547.

The square root of 745095249721 is 863189.

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., 8210353321 + 736884896400 = 90611^2 + 858420^2 .

It is not a de Polignac number, because 745095249721 - 2³ = 745095249713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745095249121) 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, 2968506846 + ... + 2968507096.

Almost surely, 2^745095249721 is an apocalyptic number.

745095249721 is the 863189-th square number.

745095249721 is the 431595-th centered octagonal number.

It is an amenable number.

745095249721 is a deficient number, since it is larger than the sum of its proper divisors (48811053878).

745095249721 is an frugal number, since it uses more digits than its factorization.

745095249721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 55.

The spelling of 745095249721 in words is "seven hundred forty-five billion, ninety-five million, two hundred forty-nine thousand, seven hundred twenty-one".