818553642 has 16 divisors (see below), whose sum is σ = 1637388192. Its totient is φ = 272804400.

The previous prime is 818553641. The next prime is 818553653. The reversal of 818553642 is 246355818.

It is a junction number, because it is equal to n+sod(n) for n = 818553594 and 818553603.

It is not an unprimeable number, because it can be changed into a prime (818553641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59517 + ... + 71967.

It is an arithmetic number, because the mean of its divisors is an integer number (102336762).

Almost surely, 2^818553642 is an apocalyptic number.

818553642 is an abundant number, since it is smaller than the sum of its proper divisors (818834550).

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

818553642 is a wasteful number, since it uses less digits than its factorization.

818553642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23413.

The product of its digits is 230400, while the sum is 42.

The square root of 818553642 is about 28610.3764742794. The cubic root of 818553642 is about 935.4395226419.

The spelling of 818553642 in words is "eight hundred eighteen million, five hundred fifty-three thousand, six hundred forty-two".