919163156225 has 24 divisors (see below), whose sum is σ = 1142340988920. Its totient is φ = 733667742720.

The previous prime is 919163156213. The next prime is 919163156291. The reversal of 919163156225 is 522651361919.

It can be written as a sum of positive squares in 12 ways, for example, as 141198583696 + 777964572529 = 375764^2 + 882023^2 .

It is not a de Polignac number, because 919163156225 - 2¹² = 919163152129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53143679 + ... + 53160971.

It is an arithmetic number, because the mean of its divisors is an integer number (47597541205).

Almost surely, 2^919163156225 is an apocalyptic number.

It is an amenable number.

919163156225 is a deficient number, since it is larger than the sum of its proper divisors (223177832695).

919163156225 is a wasteful number, since it uses less digits than its factorization.

919163156225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21989 (or 21984 counting only the distinct ones).

The product of its digits is 874800, while the sum is 50.

The spelling of 919163156225 in words is "nine hundred nineteen billion, one hundred sixty-three million, one hundred fifty-six thousand, two hundred twenty-five".