261646127072506 has 8 divisors (see below), whose sum is σ = 428148207936864. Its totient is φ = 118930057760220.

The previous prime is 261646127072479. The next prime is 261646127072521. The reversal of 261646127072506 is 605270721646162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×261646127072506² (a number of 30 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 5946502887990 + ... + 5946502888033.

It is an arithmetic number, because the mean of its divisors is an integer number (53518525992108).

Almost surely, 2^{261646127072506} is an apocalyptic number.

261646127072506 is a deficient number, since it is larger than the sum of its proper divisors (166502080864358).

261646127072506 is a wasteful number, since it uses less digits than its factorization.

261646127072506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11893005776036.

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 261646127072506 in words is "two hundred sixty-one trillion, six hundred forty-six billion, one hundred twenty-seven million, seventy-two thousand, five hundred six".