898181378642 has 4 divisors (see below), whose sum is σ = 1347272067966. Its totient is φ = 449090689320.

The previous prime is 898181378639. The next prime is 898181378671. The reversal of 898181378642 is 246873181898.

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., 451905273121 + 446276105521 = 672239^2 + 668039^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224545344659 + ... + 224545344662.

Almost surely, 2^898181378642 is an apocalyptic number.

898181378642 is a deficient number, since it is larger than the sum of its proper divisors (449090689324).

898181378642 is a wasteful number, since it uses less digits than its factorization.

898181378642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449090689323.

The product of its digits is 37158912, while the sum is 65.

The spelling of 898181378642 in words is "eight hundred ninety-eight billion, one hundred eighty-one million, three hundred seventy-eight thousand, six hundred forty-two".