261047063898 has 20 divisors (see below), whose sum is σ = 584938791690. Its totient is φ = 87015687912.

The previous prime is 261047063881. The next prime is 261047063911. The reversal of 261047063898 is 898360740162.

261047063898 is a `hidden beast` number, since 26 + 1 + 0 + 470 + 63 + 8 + 98 = 666.

It can be written as a sum of positive squares in only one way, i.e., 260249961609 + 797102289 = 510147^2 + 28233^2 .

It is a super-3 number, since 3×261047063898³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 805700653 + ... + 805700976.

Almost surely, 2^261047063898 is an apocalyptic number.

261047063898 is an abundant number, since it is smaller than the sum of its proper divisors (323891727792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261047063898 is a wasteful number, since it uses less digits than its factorization.

261047063898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611401643 (or 1611401634 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 261047063898 in words is "two hundred sixty-one billion, forty-seven million, sixty-three thousand, eight hundred ninety-eight".