745559561 has 4 divisors (see below), whose sum is σ = 747220500. Its totient is φ = 743898624.

The previous prime is 745559527. The next prime is 745559603. The reversal of 745559561 is 165955547.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165955547 = 17 ⋅9762091.

It can be written as a sum of positive squares in 2 ways, for example, as 616032400 + 129527161 = 24820^2 + 11381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-745559561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745559161) 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, 829796 + ... + 830693.

It is an arithmetic number, because the mean of its divisors is an integer number (186805125).

Almost surely, 2^745559561 is an apocalyptic number.

It is an amenable number.

745559561 is a deficient number, since it is larger than the sum of its proper divisors (1660939).

745559561 is a wasteful number, since it uses less digits than its factorization.

745559561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660938.

The product of its digits is 945000, while the sum is 47.

The square root of 745559561 is about 27304.9365683204. The cubic root of 745559561 is about 906.7636764682.

The spelling of 745559561 in words is "seven hundred forty-five million, five hundred fifty-nine thousand, five hundred sixty-one".