611778225 has 12 divisors (see below), whose sum is σ = 1011473456. Its totient is φ = 326281680.

The previous prime is 611778221. The next prime is 611778247. The reversal of 611778225 is 522877116.

It is not a de Polignac number, because 611778225 - 2² = 611778221 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611778221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4078447 + ... + 4078596.

Almost surely, 2^611778225 is an apocalyptic number.

It is an amenable number.

611778225 is a deficient number, since it is larger than the sum of its proper divisors (399695231).

611778225 is a wasteful number, since it uses less digits than its factorization.

611778225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8157056 (or 8157051 counting only the distinct ones).

The product of its digits is 47040, while the sum is 39.

The square root of 611778225 is about 24734.1509860355. The cubic root of 611778225 is about 848.9159074369.

It can be divided in two parts, 6 and 11778225, that added together give a triangular number (11778231 = T₄₈₅₃).

The spelling of 611778225 in words is "six hundred eleven million, seven hundred seventy-eight thousand, two hundred twenty-five".