25215978804945 has 16 divisors (see below), whose sum is σ = 40437469438080. Its totient is φ = 13417887579264.

The previous prime is 25215978804917. The next prime is 25215978805057. The reversal of 25215978804945 is 54940887951252.

It is not a de Polignac number, because 25215978804945 - 2¹⁶ = 25215978739409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25215978804945.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1914646324 + ... + 1914659493.

It is an arithmetic number, because the mean of its divisors is an integer number (2527341839880).

Almost surely, 2^{25215978804945} is an apocalyptic number.

It is an amenable number.

25215978804945 is a deficient number, since it is larger than the sum of its proper divisors (15221490633135).

25215978804945 is a wasteful number, since it uses less digits than its factorization.

25215978804945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3829306264.

The product of its (nonzero) digits is 290304000, while the sum is 69.

The spelling of 25215978804945 in words is "twenty-five trillion, two hundred fifteen billion, nine hundred seventy-eight million, eight hundred four thousand, nine hundred forty-five".