20151251225 has 72 divisors (see below), whose sum is σ = 29495612160. Its totient is φ = 13616037120.

The previous prime is 20151251161. The next prime is 20151251261. The reversal of 20151251225 is 52215215102.

It is a happy number.

It is not a de Polignac number, because 20151251225 - 2⁶ = 20151251161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20151251194 and 20151251203.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 28026416 + ... + 28027134.

It is an arithmetic number, because the mean of its divisors is an integer number (409661280).

Almost surely, 2^20151251225 is an apocalyptic number.

20151251225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20151251225 is a deficient number, since it is larger than the sum of its proper divisors (9344360935).

20151251225 is a wasteful number, since it uses less digits than its factorization.

20151251225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047 (or 1035 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 20151251225 its reverse (52215215102), we get a palindrome (72366466327).

The spelling of 20151251225 in words is "twenty billion, one hundred fifty-one million, two hundred fifty-one thousand, two hundred twenty-five".