261533266004 has 12 divisors (see below), whose sum is σ = 457940787444. Its totient is φ = 130693041024.

The previous prime is 261533265991. The next prime is 261533266021. The reversal of 261533266004 is 400662335162.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 170075409604 + 91457856400 = 412402^2 + 302420^2 .

It is a congruent number.

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, 18389999 + ... + 18404214.

It is an arithmetic number, because the mean of its divisors is an integer number (38161732287).

Almost surely, 2^261533266004 is an apocalyptic number.

It is an amenable number.

261533266004 is a deficient number, since it is larger than the sum of its proper divisors (196407521440).

261533266004 is a wasteful number, since it uses less digits than its factorization.

261533266004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36795994 (or 36795992 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

The spelling of 261533266004 in words is "two hundred sixty-one billion, five hundred thirty-three million, two hundred sixty-six thousand, four".