261801673570 has 16 divisors (see below), whose sum is σ = 471273172920. Its totient is φ = 104713967104.

The previous prime is 261801673489. The next prime is 261801673571. The reversal of 261801673570 is 75376108162.

It can be written as a sum of positive squares in 4 ways, for example, as 211047441201 + 50754232369 = 459399^2 + 225287^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261801673570.

It is not an unprimeable number, because it can be changed into a prime (261801673571) 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, 672175 + ... + 987634.

Almost surely, 2^261801673570 is an apocalyptic number.

261801673570 is a deficient number, since it is larger than the sum of its proper divisors (209471499350).

261801673570 is a wasteful number, since it uses less digits than its factorization.

261801673570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675589.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 261801673570 in words is "two hundred sixty-one billion, eight hundred one million, six hundred seventy-three thousand, five hundred seventy".