261647522057403 has 64 divisors (see below), whose sum is σ = 438276292300800. Its totient is φ = 153396701821440.

The previous prime is 261647522057377. The next prime is 261647522057419. The reversal of 261647522057403 is 304750225746162.

261647522057403 is a `hidden beast` number, since 2 + 6 + 1 + 6 + 4 + 7 + 5 + 220 + 5 + 7 + 403 = 666.

It is not a de Polignac number, because 261647522057403 - 2⁸ = 261647522057147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261647522057403.

It is not an unprimeable number, because it can be changed into a prime (261647522057483) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 316627501 + ... + 317452782.

It is an arithmetic number, because the mean of its divisors is an integer number (6848067067200).

Almost surely, 2^{261647522057403} is an apocalyptic number.

261647522057403 is a deficient number, since it is larger than the sum of its proper divisors (176628770243397).

261647522057403 is a wasteful number, since it uses less digits than its factorization.

261647522057403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634080369 (or 634080363 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 54.

The spelling of 261647522057403 in words is "two hundred sixty-one trillion, six hundred forty-seven billion, five hundred twenty-two million, fifty-seven thousand, four hundred three".