75640325381 has 2 divisors, whose sum is σ = 75640325382. Its totient is φ = 75640325380.

The previous prime is 75640325219. The next prime is 75640325401. The reversal of 75640325381 is 18352304657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39527404225 + 36112921156 = 198815^2 + 190034^2 .

It is an emirp because it is prime and its reverse (18352304657) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75640325381 is a prime.

It is a super-2 number, since 2×75640325381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75640325081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37820162690 + 37820162691.

It is an arithmetic number, because the mean of its divisors is an integer number (37820162691).

Almost surely, 2^75640325381 is an apocalyptic number.

It is an amenable number.

75640325381 is a deficient number, since it is larger than the sum of its proper divisors (1).

75640325381 is an equidigital number, since it uses as much as digits as its factorization.

75640325381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 75640325381 in words is "seventy-five billion, six hundred forty million, three hundred twenty-five thousand, three hundred eighty-one".