261016858 has 16 divisors (see below), whose sum is σ = 399165984. Its totient is φ = 127979280.

The previous prime is 261016771. The next prime is 261016883. The reversal of 261016858 is 858610162.

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, 26128 + ... + 34708.

It is an arithmetic number, because the mean of its divisors is an integer number (24947874).

Almost surely, 2^261016858 is an apocalyptic number.

261016858 is a deficient number, since it is larger than the sum of its proper divisors (138149126).

261016858 is a wasteful number, since it uses less digits than its factorization.

261016858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8877.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 261016858 is about 16156.0161549808. The cubic root of 261016858 is about 639.0814116784.

The spelling of 261016858 in words is "two hundred sixty-one million, sixteen thousand, eight hundred fifty-eight".