402646844818 has 4 divisors (see below), whose sum is σ = 603970267230. Its totient is φ = 201323422408.

The previous prime is 402646844813. The next prime is 402646844837. The reversal of 402646844818 is 818448646204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 391479216489 + 11167628329 = 625683^2 + 105677^2 .

It is not an unprimeable number, because it can be changed into a prime (402646844813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100661711203 + ... + 100661711206.

Almost surely, 2^402646844818 is an apocalyptic number.

402646844818 is a deficient number, since it is larger than the sum of its proper divisors (201323422412).

402646844818 is a wasteful number, since it uses less digits than its factorization.

402646844818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201323422411.

The product of its (nonzero) digits is 9437184, while the sum is 55.

The spelling of 402646844818 in words is "four hundred two billion, six hundred forty-six million, eight hundred forty-four thousand, eight hundred eighteen".