76540202581 has 2 divisors, whose sum is σ = 76540202582. Its totient is φ = 76540202580.

The previous prime is 76540202579. The next prime is 76540202597. The reversal of 76540202581 is 18520204567.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76515858225 + 24344356 = 276615^2 + 4934^2 .

It is a cyclic number.

It is not a de Polignac number, because 76540202581 - 2¹ = 76540202579 is a prime.

It is a super-2 number, since 2×76540202581² (a number of 23 digits) contains 22 as substring.

Together with 76540202579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76540202881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38270101290 + 38270101291.

It is an arithmetic number, because the mean of its divisors is an integer number (38270101291).

Almost surely, 2^76540202581 is an apocalyptic number.

It is an amenable number.

76540202581 is a deficient number, since it is larger than the sum of its proper divisors (1).

76540202581 is an equidigital number, since it uses as much as digits as its factorization.

76540202581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 76540202581 in words is "seventy-six billion, five hundred forty million, two hundred two thousand, five hundred eighty-one".