198379777655 has 32 divisors (see below), whose sum is σ = 241074731520. Its totient is φ = 156706220160.

The previous prime is 198379777621. The next prime is 198379777741. The reversal of 198379777655 is 556777973891.

It is not a de Polignac number, because 198379777655 - 2¹⁴ = 198379761271 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139018052 + ... + 139019478.

It is an arithmetic number, because the mean of its divisors is an integer number (7533585360).

Almost surely, 2^198379777655 is an apocalyptic number.

198379777655 is a deficient number, since it is larger than the sum of its proper divisors (42694953865).

198379777655 is a wasteful number, since it uses less digits than its factorization.

198379777655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519.

The product of its digits is 700131600, while the sum is 74.

The spelling of 198379777655 in words is "one hundred ninety-eight billion, three hundred seventy-nine million, seven hundred seventy-seven thousand, six hundred fifty-five".