169387821434 has 8 divisors (see below), whose sum is σ = 273626480820. Its totient is φ = 78178994496.

The previous prime is 169387821433. The next prime is 169387821467. The reversal of 169387821434 is 434128783961.

It can be written as a sum of positive squares in 2 ways, for example, as 167646845809 + 1740975625 = 409447^2 + 41725^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 169387821434.

It is not an unprimeable number, because it can be changed into a prime (169387821433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3257458079 + ... + 3257458130.

Almost surely, 2^169387821434 is an apocalyptic number.

169387821434 is a deficient number, since it is larger than the sum of its proper divisors (104238659386).

169387821434 is a wasteful number, since it uses less digits than its factorization.

169387821434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6514916224.

The product of its digits is 6967296, while the sum is 56.

The spelling of 169387821434 in words is "one hundred sixty-nine billion, three hundred eighty-seven million, eight hundred twenty-one thousand, four hundred thirty-four".