75306885257 has 2 divisors, whose sum is σ = 75306885258. Its totient is φ = 75306885256.

The previous prime is 75306885239. The next prime is 75306885307. The reversal of 75306885257 is 75258860357.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75306885241 + 16 = 274421^2 + 4^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75306885257 is a prime.

It is a super-2 number, since 2×75306885257² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (75306885217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37653442628 + 37653442629.

It is an arithmetic number, because the mean of its divisors is an integer number (37653442629).

Almost surely, 2^75306885257 is an apocalyptic number.

It is an amenable number.

75306885257 is a deficient number, since it is larger than the sum of its proper divisors (1).

75306885257 is an equidigital number, since it uses as much as digits as its factorization.

75306885257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112000, while the sum is 56.

Subtracting from 75306885257 its reverse (75258860357), we obtain a triangular number (48024900 = T₉₈₀₀).

The spelling of 75306885257 in words is "seventy-five billion, three hundred six million, eight hundred eighty-five thousand, two hundred fifty-seven".