261421053064276 has 36 divisors (see below), whose sum is σ = 532201325292000. Its totient is φ = 112032804068976.

The previous prime is 261421053064261. The next prime is 261421053064279. The reversal of 261421053064276 is 672460350124162.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261421053064279) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23914606 + ... + 33087013.

It is an arithmetic number, because the mean of its divisors is an integer number (14783370147000).

Almost surely, 2^{261421053064276} is an apocalyptic number.

It is an amenable number.

261421053064276 is an abundant number, since it is smaller than the sum of its proper divisors (270780272227724).

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

261421053064276 is a wasteful number, since it uses less digits than its factorization.

261421053064276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57025036 (or 57025027 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 261421053064276 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, fifty-three million, sixty-four thousand, two hundred seventy-six".