25510015420 has 12 divisors (see below), whose sum is σ = 53571032424. Its totient is φ = 10204006160.

The previous prime is 25510015411. The next prime is 25510015463. The reversal of 25510015420 is 2451001552.

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 3 ways as a sum of consecutive naturals, for example, 637750366 + ... + 637750405.

It is an arithmetic number, because the mean of its divisors is an integer number (4464252702).

Almost surely, 2^25510015420 is an apocalyptic number.

25510015420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25510015420 is an abundant number, since it is smaller than the sum of its proper divisors (28061017004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25510015420 is a wasteful number, since it uses less digits than its factorization.

25510015420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275500780 (or 1275500778 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 25510015420 its reverse (2451001552), we get a palindrome (27961016972).

The spelling of 25510015420 in words is "twenty-five billion, five hundred ten million, fifteen thousand, four hundred twenty".