261930954788 has 24 divisors (see below), whose sum is σ = 463977285408. Its totient is φ = 129366529856.

The previous prime is 261930954787. The next prime is 261930954797. The reversal of 261930954788 is 887459039162.

It is a self number, because there is not a number n which added to its sum of digits gives 261930954788.

It is not an unprimeable number, because it can be changed into a prime (261930954787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2088095 + ... + 2209977.

It is an arithmetic number, because the mean of its divisors is an integer number (19332386892).

It is a 1-persistent number, because it is pandigital, but 2⋅261930954788 = 523861909576 is not.

Almost surely, 2^261930954788 is an apocalyptic number.

It is an amenable number.

261930954788 is a deficient number, since it is larger than the sum of its proper divisors (202046330620).

261930954788 is a wasteful number, since it uses less digits than its factorization.

261930954788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128443 (or 128441 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 261930954788 in words is "two hundred sixty-one billion, nine hundred thirty million, nine hundred fifty-four thousand, seven hundred eighty-eight".