102540441604505 has 4 divisors (see below), whose sum is σ = 123048529925412. Its totient is φ = 82032353283600.

The previous prime is 102540441604493. The next prime is 102540441604537. The reversal of 102540441604505 is 505406144045201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77668916122009 + 24871525482496 = 8812997^2 + 4987136^2 .

It is a de Polignac number, because none of the positive numbers 2^k-102540441604505 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10254044160446 + ... + 10254044160455.

It is an arithmetic number, because the mean of its divisors is an integer number (30762132481353).

Almost surely, 2^{102540441604505} is an apocalyptic number.

It is an amenable number.

102540441604505 is a deficient number, since it is larger than the sum of its proper divisors (20508088320907).

102540441604505 is an equidigital number, since it uses as much as digits as its factorization.

102540441604505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20508088320906.

The product of its (nonzero) digits is 384000, while the sum is 41.

Adding to 102540441604505 its reverse (505406144045201), we get a palindrome (607946585649706).

The spelling of 102540441604505 in words is "one hundred two trillion, five hundred forty billion, four hundred forty-one million, six hundred four thousand, five hundred five".