25315400215 has 64 divisors (see below), whose sum is σ = 37872000000. Its totient is φ = 15850598400.

The previous prime is 25315400197. The next prime is 25315400251. The reversal of 25315400215 is 51200451352.

It is not a de Polignac number, because 25315400215 - 2¹¹ = 25315398167 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20267911 + ... + 20269159.

It is an arithmetic number, because the mean of its divisors is an integer number (591750000).

Almost surely, 2^25315400215 is an apocalyptic number.

25315400215 is a deficient number, since it is larger than the sum of its proper divisors (12556599785).

25315400215 is a wasteful number, since it uses less digits than its factorization.

25315400215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 25315400215 its reverse (51200451352), we get a palindrome (76515851567).

The spelling of 25315400215 in words is "twenty-five billion, three hundred fifteen million, four hundred thousand, two hundred fifteen".