261674221743 has 48 divisors (see below), whose sum is σ = 437459533056. Its totient is φ = 148964363520.

The previous prime is 261674221729. The next prime is 261674221747. The reversal of 261674221743 is 347122476162.

261674221743 is a `hidden beast` number, since 2 + 616 + 7 + 4 + 2 + 21 + 7 + 4 + 3 = 666.

It is not a de Polignac number, because 261674221743 - 2⁹ = 261674221231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261674221747) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 691996 + ... + 1001102.

It is an arithmetic number, because the mean of its divisors is an integer number (9113740272).

Almost surely, 2^261674221743 is an apocalyptic number.

261674221743 is a deficient number, since it is larger than the sum of its proper divisors (175785311313).

261674221743 is a wasteful number, since it uses less digits than its factorization.

261674221743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309644 (or 309641 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The spelling of 261674221743 in words is "two hundred sixty-one billion, six hundred seventy-four million, two hundred twenty-one thousand, seven hundred forty-three".