261210632626 has 8 divisors (see below), whose sum is σ = 405326843820. Its totient is φ = 126101684688.

The previous prime is 261210632603. The next prime is 261210632629. The reversal of 261210632626 is 626236012162.

It can be written as a sum of positive squares in 2 ways, for example, as 244297890225 + 16912742401 = 494265^2 + 130049^2 .

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

It is not an unprimeable number, because it can be changed into a prime (261210632629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2251815741 + ... + 2251815856.

Almost surely, 2^261210632626 is an apocalyptic number.

261210632626 is a deficient number, since it is larger than the sum of its proper divisors (144116211194).

261210632626 is a wasteful number, since it uses less digits than its factorization.

261210632626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4503631628.

The product of its (nonzero) digits is 62208, while the sum is 37.

Adding to 261210632626 its reverse (626236012162), we get a palindrome (887446644788).

The spelling of 261210632626 in words is "two hundred sixty-one billion, two hundred ten million, six hundred thirty-two thousand, six hundred twenty-six".