818653513880402 has 16 divisors (see below), whose sum is σ = 1232682569962200. Its totient is φ = 407760109384320.

The previous prime is 818653513880399. The next prime is 818653513880407. The reversal of 818653513880402 is 204088315356818.

It can be written as a sum of positive squares in 4 ways, for example, as 426122755993081 + 392530757887321 = 20642741^2 + 19812389^2 .

It is not an unprimeable number, because it can be changed into a prime (818653513880407) 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, 194286377 + ... + 198455292.

Almost surely, 2^{818653513880402} is an apocalyptic number.

818653513880402 is a deficient number, since it is larger than the sum of its proper divisors (414029056081798).

818653513880402 is a wasteful number, since it uses less digits than its factorization.

818653513880402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392745661.

The product of its (nonzero) digits is 44236800, while the sum is 62.

The spelling of 818653513880402 in words is "eight hundred eighteen trillion, six hundred fifty-three billion, five hundred thirteen million, eight hundred eighty thousand, four hundred two".