261534367612464 has 40 divisors (see below), whose sum is σ = 680950374481920. Its totient is φ = 86491680625728.

The previous prime is 261534367612423. The next prime is 261534367612523. The reversal of 261534367612464 is 464216763435162.

It is a junction number, because it is equal to n+sod(n) for n = 261534367612398 and 261534367612407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21451303584 + ... + 21451315775.

It is an arithmetic number, because the mean of its divisors is an integer number (17023759362048).

Almost surely, 2^{261534367612464} is an apocalyptic number.

261534367612464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261534367612464 is an abundant number, since it is smaller than the sum of its proper divisors (419416006869456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261534367612464 is a wasteful number, since it uses less digits than its factorization.

261534367612464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42902619497 (or 42902619491 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 60.

The spelling of 261534367612464 in words is "two hundred sixty-one trillion, five hundred thirty-four billion, three hundred sixty-seven million, six hundred twelve thousand, four hundred sixty-four".