745661778724 has 24 divisors (see below), whose sum is σ = 1381733676288. Its totient is φ = 350882832000.

The previous prime is 745661778709. The next prime is 745661778731. The reversal of 745661778724 is 427877166547.

It is a super-2 number, since 2×745661778724² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1226997 + ... + 1731139.

It is an arithmetic number, because the mean of its divisors is an integer number (57572236512).

Almost surely, 2^745661778724 is an apocalyptic number.

It is an amenable number.

745661778724 is a deficient number, since it is larger than the sum of its proper divisors (636071897564).

745661778724 is a wasteful number, since it uses less digits than its factorization.

745661778724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525915 (or 525913 counting only the distinct ones).

The product of its digits is 110638080, while the sum is 64.

The spelling of 745661778724 in words is "seven hundred forty-five billion, six hundred sixty-one million, seven hundred seventy-eight thousand, seven hundred twenty-four".