618861650 has 24 divisors (see below), whose sum is σ = 1255727664. Its totient is φ = 225040400.

The previous prime is 618861637. The next prime is 618861709. The reversal of 618861650 is 56168816.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 618861598 and 618861607.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 562052 + ... + 563151.

It is an arithmetic number, because the mean of its divisors is an integer number (52321986).

Almost surely, 2^618861650 is an apocalyptic number.

618861650 is an abundant number, since it is smaller than the sum of its proper divisors (636866014).

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

618861650 is a wasteful number, since it uses less digits than its factorization.

618861650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125226 (or 1125221 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 618861650 is about 24876.9300758755. The cubic root of 618861650 is about 852.1797112957.

It can be divided in two parts, 61886 and 1650, that added together give a palindrome (63536).

The spelling of 618861650 in words is "six hundred eighteen million, eight hundred sixty-one thousand, six hundred fifty".