102540402557 has 2 divisors, whose sum is σ = 102540402558. Its totient is φ = 102540402556.

The previous prime is 102540402553. The next prime is 102540402599. The reversal of 102540402557 is 755204045201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100340698756 + 2199703801 = 316766^2 + 46901^2 .

It is a cyclic number.

It is not a de Polignac number, because 102540402557 - 2² = 102540402553 is a prime.

It is a super-2 number, since 2×102540402557² (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 (102540402553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51270201278 + 51270201279.

It is an arithmetic number, because the mean of its divisors is an integer number (51270201279).

Almost surely, 2^102540402557 is an apocalyptic number.

It is an amenable number.

102540402557 is a deficient number, since it is larger than the sum of its proper divisors (1).

102540402557 is an equidigital number, since it uses as much as digits as its factorization.

102540402557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56000, while the sum is 35.

Adding to 102540402557 its reverse (755204045201), we get a palindrome (857744447758).

The spelling of 102540402557 in words is "one hundred two billion, five hundred forty million, four hundred two thousand, five hundred fifty-seven".