745165229681 has 4 divisors (see below), whose sum is σ = 777563717952. Its totient is φ = 712766741412.

The previous prime is 745165229629. The next prime is 745165229701. The reversal of 745165229681 is 186922561547.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 745165229681 - 2¹⁰ = 745165228657 is a prime.

It is a super-2 number, since 2×745165229681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (745165225681) 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, 16199244101 + ... + 16199244146.

It is an arithmetic number, because the mean of its divisors is an integer number (194390929488).

Almost surely, 2^745165229681 is an apocalyptic number.

It is an amenable number.

745165229681 is a deficient number, since it is larger than the sum of its proper divisors (32398488271).

745165229681 is a wasteful number, since it uses less digits than its factorization.

745165229681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32398488270.

The product of its digits is 7257600, while the sum is 56.

The spelling of 745165229681 in words is "seven hundred forty-five billion, one hundred sixty-five million, two hundred twenty-nine thousand, six hundred eighty-one".