402071427818 has 4 divisors (see below), whose sum is σ = 603107141730. Its totient is φ = 201035713908.

The previous prime is 402071427811. The next prime is 402071427827. The reversal of 402071427818 is 818724170204.

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., 213539182609 + 188532245209 = 462103^2 + 434203^2 .

It is a super-2 number, since 2×402071427818² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (402071427811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100517856953 + ... + 100517856956.

Almost surely, 2^402071427818 is an apocalyptic number.

402071427818 is a deficient number, since it is larger than the sum of its proper divisors (201035713912).

402071427818 is a wasteful number, since it uses less digits than its factorization.

402071427818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201035713911.

The product of its (nonzero) digits is 200704, while the sum is 44.

The spelling of 402071427818 in words is "four hundred two billion, seventy-one million, four hundred twenty-seven thousand, eight hundred eighteen".