261143774514766 has 32 divisors (see below), whose sum is σ = 460473154092000. Its totient is φ = 109505163703680.

The previous prime is 261143774514751. The next prime is 261143774514767. The reversal of 261143774514766 is 667415477341162.

261143774514766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 261143774514698 and 261143774514707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261143774514767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273066741 + ... + 274021408.

It is an arithmetic number, because the mean of its divisors is an integer number (14389786065375).

Almost surely, 2^{261143774514766} is an apocalyptic number.

261143774514766 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

261143774514766 is a deficient number, since it is larger than the sum of its proper divisors (199329379577234).

261143774514766 is a wasteful number, since it uses less digits than its factorization.

261143774514766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547089844.

The product of its digits is 142248960, while the sum is 64.

The spelling of 261143774514766 in words is "two hundred sixty-one trillion, one hundred forty-three billion, seven hundred seventy-four million, five hundred fourteen thousand, seven hundred sixty-six".