25155021013 has 4 divisors (see below), whose sum is σ = 25171871148. Its totient is φ = 25138170880.

The previous prime is 25155020971. The next prime is 25155021019. The reversal of 25155021013 is 31012055152.

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 12574706769 + 12580314244 = 112137^2 + 112162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25155021013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25155021019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8422828 + ... + 8425813.

It is an arithmetic number, because the mean of its divisors is an integer number (6292967787).

Almost surely, 2^25155021013 is an apocalyptic number.

It is an amenable number.

25155021013 is a deficient number, since it is larger than the sum of its proper divisors (16850135).

25155021013 is a wasteful number, since it uses less digits than its factorization.

25155021013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16850134.

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 25155021013 its reverse (31012055152), we get a palindrome (56167076165).

The spelling of 25155021013 in words is "twenty-five billion, one hundred fifty-five million, twenty-one thousand, thirteen".