75645167557 has 2 divisors, whose sum is σ = 75645167558. Its totient is φ = 75645167556.

The previous prime is 75645167551. The next prime is 75645167561. The reversal of 75645167557 is 75576154657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50367029476 + 25278138081 = 224426^2 + 158991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75645167557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75645167551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37822583778 + 37822583779.

It is an arithmetic number, because the mean of its divisors is an integer number (37822583779).

Almost surely, 2^75645167557 is an apocalyptic number.

It is an amenable number.

75645167557 is a deficient number, since it is larger than the sum of its proper divisors (1).

75645167557 is an equidigital number, since it uses as much as digits as its factorization.

75645167557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30870000, while the sum is 58.

The spelling of 75645167557 in words is "seventy-five billion, six hundred forty-five million, one hundred sixty-seven thousand, five hundred fifty-seven".