261016816 has 10 divisors (see below), whose sum is σ = 505720112. Its totient is φ = 130508400.

The previous prime is 261016771. The next prime is 261016883. The reversal of 261016816 is 618610162.

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, 8156760 + ... + 8156791.

Almost surely, 2^261016816 is an apocalyptic number.

It is an amenable number.

261016816 is a deficient number, since it is larger than the sum of its proper divisors (244703296).

261016816 is a wasteful number, since it uses less digits than its factorization.

261016816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16313559 (or 16313553 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 261016816 is about 16156.0148551553. The cubic root of 261016816 is about 639.0813774004.

Adding to 261016816 its reverse (618610162), we get a palindrome (879626978).

The spelling of 261016816 in words is "two hundred sixty-one million, sixteen thousand, eight hundred sixteen".