261646734163157 has 8 divisors (see below), whose sum is σ = 307106591450496. Its totient is φ = 218207314977552.

The previous prime is 261646734163141. The next prime is 261646734163267. The reversal of 261646734163157 is 751361437646162.

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

It is a cyclic number.

It is not a de Polignac number, because 261646734163157 - 2⁴ = 261646734163141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261646734163157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261646734163357) 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 7 ways as a sum of consecutive naturals, for example, 505109525153 + ... + 505109525670.

It is an arithmetic number, because the mean of its divisors is an integer number (38388323931312).

Almost surely, 2^{261646734163157} is an apocalyptic number.

It is an amenable number.

261646734163157 is a deficient number, since it is larger than the sum of its proper divisors (45459857287339).

261646734163157 is a wasteful number, since it uses less digits than its factorization.

261646734163157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010219050867.

The product of its digits is 91445760, while the sum is 62.

The spelling of 261646734163157 in words is "two hundred sixty-one trillion, six hundred forty-six billion, seven hundred thirty-four million, one hundred sixty-three thousand, one hundred fifty-seven".