261563246154 has 48 divisors (see below), whose sum is σ = 647728091712. Its totient is φ = 74726855424.

The previous prime is 261563246107. The next prime is 261563246159. The reversal of 261563246154 is 451642365162.

261563246154 is a `hidden beast` number, since 2 + 6 + 1 + 5 + 6 + 3 + 24 + 615 + 4 = 666.

261563246154 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261563246159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1830337 + ... + 1968059.

It is an arithmetic number, because the mean of its divisors is an integer number (13494335244).

Almost surely, 2^261563246154 is an apocalyptic number.

261563246154 is an abundant number, since it is smaller than the sum of its proper divisors (386164845558).

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

261563246154 is a wasteful number, since it uses less digits than its factorization.

261563246154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152811 (or 152808 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The spelling of 261563246154 in words is "two hundred sixty-one billion, five hundred sixty-three million, two hundred forty-six thousand, one hundred fifty-four".