641118745 has 4 divisors (see below), whose sum is σ = 769342500. Its totient is φ = 512894992.

The previous prime is 641118743. The next prime is 641118757. The reversal of 641118745 is 547811146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547811146 = 2 ⋅273905573.

It can be written as a sum of positive squares in 2 ways, for example, as 68425984 + 572692761 = 8272^2 + 23931^2 .

It is a cyclic number.

It is not a de Polignac number, because 641118745 - 2¹ = 641118743 is a prime.

It is a super-2 number, since 2×641118745² = 822066490380750050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641118743) 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, 64111870 + ... + 64111879.

It is an arithmetic number, because the mean of its divisors is an integer number (192335625).

Almost surely, 2^641118745 is an apocalyptic number.

It is an amenable number.

641118745 is a deficient number, since it is larger than the sum of its proper divisors (128223755).

641118745 is a wasteful number, since it uses less digits than its factorization.

641118745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128223754.

The product of its digits is 26880, while the sum is 37.

The square root of 641118745 is about 25320.3227665052. The cubic root of 641118745 is about 862.2757218436.

The spelling of 641118745 in words is "six hundred forty-one million, one hundred eighteen thousand, seven hundred forty-five".