261534321474772 has 12 divisors (see below), whose sum is σ = 457702599261600. Its totient is φ = 130762150257176.

The previous prime is 261534321474757. The next prime is 261534321474779. The reversal of 261534321474772 is 277474123435162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261534321474779) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1252502608 + ... + 1252711399.

It is an arithmetic number, because the mean of its divisors is an integer number (38141883271800).

Almost surely, 2^{261534321474772} is an apocalyptic number.

It is an amenable number.

261534321474772 is a deficient number, since it is larger than the sum of its proper divisors (196168277786828).

261534321474772 is a wasteful number, since it uses less digits than its factorization.

261534321474772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2505240110 (or 2505240108 counting only the distinct ones).

The product of its digits is 47416320, while the sum is 58.

The spelling of 261534321474772 in words is "two hundred sixty-one trillion, five hundred thirty-four billion, three hundred twenty-one million, four hundred seventy-four thousand, seven hundred seventy-two".