261005450164 has 24 divisors (see below), whose sum is σ = 480906447840. Its totient is φ = 123606663264.

The previous prime is 261005450161. The next prime is 261005450267. The reversal of 261005450164 is 461054500162.

261005450164 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261005450161) 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 7 ways as a sum of consecutive naturals, for example, 35899 + ... + 723394.

It is an arithmetic number, because the mean of its divisors is an integer number (20037768660).

Almost surely, 2^261005450164 is an apocalyptic number.

It is an amenable number.

261005450164 is a deficient number, since it is larger than the sum of its proper divisors (219900997676).

261005450164 is a wasteful number, since it uses less digits than its factorization.

261005450164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763839 (or 763837 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 261005450164 in words is "two hundred sixty-one billion, five million, four hundred fifty thousand, one hundred sixty-four".