261777116 has 12 divisors (see below), whose sum is σ = 459894288. Its totient is φ = 130378752.

The previous prime is 261777091. The next prime is 261777119. The reversal of 261777116 is 611777162.

It is a happy number.

It is a super-2 number, since 2×261777116² = 137054516922554912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261777116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261777119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126296 + ... + 128351.

It is an arithmetic number, because the mean of its divisors is an integer number (38324524).

Almost surely, 2^261777116 is an apocalyptic number.

It is an amenable number.

261777116 is a deficient number, since it is larger than the sum of its proper divisors (198117172).

261777116 is a wasteful number, since it uses less digits than its factorization.

261777116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254908 (or 254906 counting only the distinct ones).

The product of its digits is 24696, while the sum is 38.

The square root of 261777116 is about 16179.5276816105. The cubic root of 261777116 is about 639.7012896396.

The spelling of 261777116 in words is "two hundred sixty-one million, seven hundred seventy-seven thousand, one hundred sixteen".