261929855437472 has 48 divisors (see below), whose sum is σ = 524133570616992. Its totient is φ = 128816612632320.

The previous prime is 261929855437427. The next prime is 261929855437483. The reversal of 261929855437472 is 274734558929162.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 261929855437472.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200488823 + ... + 201791049.

It is an arithmetic number, because the mean of its divisors is an integer number (10919449387854).

Almost surely, 2^{261929855437472} is an apocalyptic number.

It is an amenable number.

261929855437472 is an abundant number, since it is smaller than the sum of its proper divisors (262203715179520).

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

261929855437472 is a wasteful number, since it uses less digits than its factorization.

261929855437472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405341 (or 1405333 counting only the distinct ones).

The product of its digits is 1828915200, while the sum is 74.

The spelling of 261929855437472 in words is "two hundred sixty-one trillion, nine hundred twenty-nine billion, eight hundred fifty-five million, four hundred thirty-seven thousand, four hundred seventy-two".