102523960521581 has 2 divisors, whose sum is σ = 102523960521582. Its totient is φ = 102523960521580.

The previous prime is 102523960521571. The next prime is 102523960521607. The reversal of 102523960521581 is 185125069325201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64143023816356 + 38380936705225 = 8008934^2 + 6195235^2 .

It is a cyclic number.

It is not a de Polignac number, because 102523960521581 - 2²² = 102523956327277 is a prime.

It is a super-2 number, since 2×102523960521581² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102523960521571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51261980260790 + 51261980260791.

It is an arithmetic number, because the mean of its divisors is an integer number (51261980260791).

Almost surely, 2^{102523960521581} is an apocalyptic number.

It is an amenable number.

102523960521581 is a deficient number, since it is larger than the sum of its proper divisors (1).

102523960521581 is an equidigital number, since it uses as much as digits as its factorization.

102523960521581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296000, while the sum is 50.

The spelling of 102523960521581 in words is "one hundred two trillion, five hundred twenty-three billion, nine hundred sixty million, five hundred twenty-one thousand, five hundred eighty-one".