261163787476 has 24 divisors (see below), whose sum is σ = 474064141320. Its totient is φ = 125741035392.

The previous prime is 261163787473. The next prime is 261163787539. The reversal of 261163787476 is 674787361162.

261163787476 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 58191912900 + 202971874576 = 241230^2 + 450524^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a self number, because there is not a number n which added to its sum of digits gives 261163787476.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261163787471) 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, 2974711 + ... + 3061246.

It is an arithmetic number, because the mean of its divisors is an integer number (19752672555).

Almost surely, 2^261163787476 is an apocalyptic number.

It is an amenable number.

261163787476 is a deficient number, since it is larger than the sum of its proper divisors (212900353844).

261163787476 is a wasteful number, since it uses less digits than its factorization.

261163787476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6036363 (or 6036361 counting only the distinct ones).

The product of its digits is 14224896, while the sum is 58.

The spelling of 261163787476 in words is "two hundred sixty-one billion, one hundred sixty-three million, seven hundred eighty-seven thousand, four hundred seventy-six".