402168078434 has 4 divisors (see below), whose sum is σ = 603252117654. Its totient is φ = 201084039216.

The previous prime is 402168078401. The next prime is 402168078437. The reversal of 402168078434 is 434870861204.

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., 371069814025 + 31098264409 = 609155^2 + 176347^2 .

It is a super-2 number, since 2×402168078434² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (402168078437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100542019607 + ... + 100542019610.

Almost surely, 2^402168078434 is an apocalyptic number.

402168078434 is a deficient number, since it is larger than the sum of its proper divisors (201084039220).

402168078434 is a wasteful number, since it uses less digits than its factorization.

402168078434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201084039219.

The product of its (nonzero) digits is 1032192, while the sum is 47.

The spelling of 402168078434 in words is "four hundred two billion, one hundred sixty-eight million, seventy-eight thousand, four hundred thirty-four".