261646734157453 has 8 divisors (see below), whose sum is σ = 262491711731136. Its totient is φ = 260802902318400.

The previous prime is 261646734157423. The next prime is 261646734157463. The reversal of 261646734157453 is 354751437646162.

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 261646734157453 - 2¹³ = 261646734149261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261646734157423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285976188 + ... + 286889653.

It is an arithmetic number, because the mean of its divisors is an integer number (32811463966392).

Almost surely, 2^{261646734157453} is an apocalyptic number.

It is an amenable number.

261646734157453 is a deficient number, since it is larger than the sum of its proper divisors (844977573683).

261646734157453 is a wasteful number, since it uses less digits than its factorization.

261646734157453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572867315.

The product of its digits is 304819200, while the sum is 64.

The spelling of 261646734157453 in words is "two hundred sixty-one trillion, six hundred forty-six billion, seven hundred thirty-four million, one hundred fifty-seven thousand, four hundred fifty-three".