25545902361 has 16 divisors (see below), whose sum is σ = 40619572224. Its totient is φ = 13962977424.

The previous prime is 25545902359. The next prime is 25545902399. The reversal of 25545902361 is 16320954552.

It is a happy number.

It is not a de Polignac number, because 25545902361 - 2¹ = 25545902359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25545902461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26444551 + ... + 26445516.

It is an arithmetic number, because the mean of its divisors is an integer number (2538723264).

Almost surely, 2^25545902361 is an apocalyptic number.

25545902361 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25545902361 is a deficient number, since it is larger than the sum of its proper divisors (15073669863).

25545902361 is a wasteful number, since it uses less digits than its factorization.

25545902361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52890100.

The product of its (nonzero) digits is 324000, while the sum is 42.

The spelling of 25545902361 in words is "twenty-five billion, five hundred forty-five million, nine hundred two thousand, three hundred sixty-one".