198278647061 has 32 divisors (see below), whose sum is σ = 227453529600. Its totient is φ = 171199586880.

The previous prime is 198278647057. The next prime is 198278647069. The reversal of 198278647061 is 160746872891.

It is a cyclic number.

It is not a de Polignac number, because 198278647061 - 2² = 198278647057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198278647069) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49333310 + ... + 49337328.

It is an arithmetic number, because the mean of its divisors is an integer number (7107922800).

Almost surely, 2^198278647061 is an apocalyptic number.

198278647061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

198278647061 is a deficient number, since it is larger than the sum of its proper divisors (29174882539).

198278647061 is a wasteful number, since it uses less digits than its factorization.

198278647061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6929.

The product of its (nonzero) digits is 8128512, while the sum is 59.

The spelling of 198278647061 in words is "one hundred ninety-eight billion, two hundred seventy-eight million, six hundred forty-seven thousand, sixty-one".