642096757 has 2 divisors, whose sum is σ = 642096758. Its totient is φ = 642096756.

The previous prime is 642096737. The next prime is 642096761. The reversal of 642096757 is 757690246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 410022001 + 232074756 = 20249^2 + 15234^2 .

It is a cyclic number.

It is not a de Polignac number, because 642096757 - 2²³ = 633708149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642096737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321048378 + 321048379.

It is an arithmetic number, because the mean of its divisors is an integer number (321048379).

Almost surely, 2^642096757 is an apocalyptic number.

It is an amenable number.

642096757 is a deficient number, since it is larger than the sum of its proper divisors (1).

642096757 is an equidigital number, since it uses as much as digits as its factorization.

642096757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 46.

The square root of 642096757 is about 25339.6281937995. The cubic root of 642096757 is about 862.7139597172.

The spelling of 642096757 in words is "six hundred forty-two million, ninety-six thousand, seven hundred fifty-seven".