261861982034 has 8 divisors (see below), whose sum is σ = 415898442108. Its totient is φ = 123229168000.

The previous prime is 261861981929. The next prime is 261861982121. The reversal of 261861982034 is 430289168162.

It can be written as a sum of positive squares in 2 ways, for example, as 225952869025 + 35909113009 = 475345^2 + 189497^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3850911467 + ... + 3850911534.

Almost surely, 2^261861982034 is an apocalyptic number.

261861982034 is a deficient number, since it is larger than the sum of its proper divisors (154036460074).

261861982034 is a wasteful number, since it uses less digits than its factorization.

261861982034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7701823020.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 261861982034 in words is "two hundred sixty-one billion, eight hundred sixty-one million, nine hundred eighty-two thousand, thirty-four".