745217294581 has 8 divisors (see below), whose sum is σ = 779576405400. Its totient is φ = 711435648000.

The previous prime is 745217294579. The next prime is 745217294677. The reversal of 745217294581 is 185492712547.

It can be written as a sum of positive squares in 4 ways, for example, as 150575817681 + 594641476900 = 388041^2 + 771130^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 745217294581 - 2¹ = 745217294579 is a prime.

It is a super-2 number, since 2×745217294581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745217294501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144363420 + ... + 144368581.

It is an arithmetic number, because the mean of its divisors is an integer number (97447050675).

Almost surely, 2^745217294581 is an apocalyptic number.

It is an amenable number.

745217294581 is a deficient number, since it is larger than the sum of its proper divisors (34359110819).

745217294581 is a wasteful number, since it uses less digits than its factorization.

745217294581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288732119.

The product of its digits is 5644800, while the sum is 55.

The spelling of 745217294581 in words is "seven hundred forty-five billion, two hundred seventeen million, two hundred ninety-four thousand, five hundred eighty-one".