198774560261 has 8 divisors (see below), whose sum is σ = 203301062784. Its totient is φ = 194260443520.

The previous prime is 198774560251. The next prime is 198774560273. The reversal of 198774560261 is 162065477891.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 198774560261 - 2¹⁸ = 198774298117 is a prime.

It is a super-2 number, since 2×198774560261² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198774560197 and 198774560206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198774560251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3063980 + ... + 3128181.

It is an arithmetic number, because the mean of its divisors is an integer number (25412632848).

Almost surely, 2^198774560261 is an apocalyptic number.

It is an amenable number.

198774560261 is a deficient number, since it is larger than the sum of its proper divisors (4526502523).

198774560261 is an equidigital number, since it uses as much as digits as its factorization.

198774560261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6192891.

The product of its (nonzero) digits is 5080320, while the sum is 56.

The spelling of 198774560261 in words is "one hundred ninety-eight billion, seven hundred seventy-four million, five hundred sixty thousand, two hundred sixty-one".