261657023020232 has 32 divisors (see below), whose sum is σ = 560704854769920. Its totient is φ = 112136477349120.

The previous prime is 261657023020229. The next prime is 261657023020271. The reversal of 261657023020232 is 232020320756162.

It is a self number, because there is not a number n which added to its sum of digits gives 261657023020232.

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, 43986944 + ... + 49579887.

It is an arithmetic number, because the mean of its divisors is an integer number (17522026711560).

Almost surely, 2^{261657023020232} is an apocalyptic number.

It is an amenable number.

261657023020232 is an abundant number, since it is smaller than the sum of its proper divisors (299047831749688).

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

261657023020232 is a wasteful number, since it uses less digits than its factorization.

261657023020232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93616781 (or 93616777 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 41.

Adding to 261657023020232 its reverse (232020320756162), we get a palindrome (493677343776394).

The spelling of 261657023020232 in words is "two hundred sixty-one trillion, six hundred fifty-seven billion, twenty-three million, twenty thousand, two hundred thirty-two".