261663434 has 16 divisors (see below), whose sum is σ = 397191168. Its totient is φ = 129274992.

The previous prime is 261663397. The next prime is 261663481. The reversal of 261663434 is 434366162.

It is a junction number, because it is equal to n+sod(n) for n = 261663394 and 261663403.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64844 + ... + 68760.

It is an arithmetic number, because the mean of its divisors is an integer number (24824448).

Almost surely, 2^261663434 is an apocalyptic number.

261663434 is a deficient number, since it is larger than the sum of its proper divisors (135527734).

261663434 is a wasteful number, since it uses less digits than its factorization.

261663434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4309.

The product of its digits is 62208, while the sum is 35.

The square root of 261663434 is about 16176.0141567693. The cubic root of 261663434 is about 639.6086751632.

The spelling of 261663434 in words is "two hundred sixty-one million, six hundred sixty-three thousand, four hundred thirty-four".