261487784098 has 8 divisors (see below), whose sum is σ = 392253616620. Its totient is φ = 130736578560.

The previous prime is 261487784087. The next prime is 261487784101. The reversal of 261487784098 is 890487784162.

261487784098 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 261066836809 + 420947289 = 510947^2 + 20517^2 .

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

It is a super-2 number, since 2×261487784098² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3611943 + ... + 3683626.

Almost surely, 2^261487784098 is an apocalyptic number.

261487784098 is a deficient number, since it is larger than the sum of its proper divisors (130765832522).

261487784098 is a wasteful number, since it uses less digits than its factorization.

261487784098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7313492.

The product of its (nonzero) digits is 43352064, while the sum is 64.

Adding to 261487784098 its sum of digits (64), we get a palindrome (261487784162).

The spelling of 261487784098 in words is "two hundred sixty-one billion, four hundred eighty-seven million, seven hundred eighty-four thousand, ninety-eight".