261404852616766 has 16 divisors (see below), whose sum is σ = 409157976603168. Its totient is φ = 125018931391200.

The previous prime is 261404852616757. The next prime is 261404852616767. The reversal of 261404852616766 is 667616258404162.

It is a junction number, because it is equal to n+sod(n) for n = 261404852616698 and 261404852616707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261404852616767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10263825 + ... + 25063036.

It is an arithmetic number, because the mean of its divisors is an integer number (25572373537698).

Almost surely, 2^{261404852616766} is an apocalyptic number.

261404852616766 is a deficient number, since it is larger than the sum of its proper divisors (147753123986402).

261404852616766 is a wasteful number, since it uses less digits than its factorization.

261404852616766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35487747.

The product of its (nonzero) digits is 139345920, while the sum is 64.

The spelling of 261404852616766 in words is "two hundred sixty-one trillion, four hundred four billion, eight hundred fifty-two million, six hundred sixteen thousand, seven hundred sixty-six".