5642391761 has 4 divisors (see below), whose sum is σ = 5650441524. Its totient is φ = 5634342000.

The previous prime is 5642391721. The next prime is 5642391773. The reversal of 5642391761 is 1671932465.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4441422736 + 1200969025 = 66644^2 + 34655^2 .

It is a cyclic number.

It is not a de Polignac number, because 5642391761 - 2⁶ = 5642391697 is a prime.

It is a super-2 number, since 2×5642391761² = 63673169569201362242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5642391721) 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, 4023830 + ... + 4025231.

It is an arithmetic number, because the mean of its divisors is an integer number (1412610381).

Almost surely, 2^5642391761 is an apocalyptic number.

It is an amenable number.

5642391761 is a deficient number, since it is larger than the sum of its proper divisors (8049763).

5642391761 is an equidigital number, since it uses as much as digits as its factorization.

5642391761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8049762.

The product of its digits is 272160, while the sum is 44.

The square root of 5642391761 is about 75115.8555898820. The cubic root of 5642391761 is about 1780.2776742466.

The spelling of 5642391761 in words is "five billion, six hundred forty-two million, three hundred ninety-one thousand, seven hundred sixty-one".