261063886 has 4 divisors (see below), whose sum is σ = 391595832. Its totient is φ = 130531942.

The previous prime is 261063877. The next prime is 261063937. The reversal of 261063886 is 688360162.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65265970 + ... + 65265973.

It is an arithmetic number, because the mean of its divisors is an integer number (97898958).

Almost surely, 2^261063886 is an apocalyptic number.

261063886 is a deficient number, since it is larger than the sum of its proper divisors (130531946).

261063886 is a wasteful number, since it uses less digits than its factorization.

261063886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130531945.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 261063886 is about 16157.4715224877. The cubic root of 261063886 is about 639.1197909566.

It can be divided in two parts, 26106 and 3886, that added together give a palindrome (29992).

The spelling of 261063886 in words is "two hundred sixty-one million, sixty-three thousand, eight hundred eighty-six".