261647045357307 has 16 divisors (see below), whose sum is σ = 350002526338080. Its totient is φ = 173861891996672.

The previous prime is 261647045357303. The next prime is 261647045357339. The reversal of 261647045357307 is 703753540746162.

It is a cyclic number.

It is not a de Polignac number, because 261647045357307 - 2² = 261647045357303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261647045357303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51056268 + ... + 55946729.

It is an arithmetic number, because the mean of its divisors is an integer number (21875157896130).

Almost surely, 2^{261647045357307} is an apocalyptic number.

261647045357307 is a deficient number, since it is larger than the sum of its proper divisors (88355480980773).

261647045357307 is a wasteful number, since it uses less digits than its factorization.

261647045357307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107005662.

The product of its (nonzero) digits is 88905600, while the sum is 60.

The spelling of 261647045357307 in words is "two hundred sixty-one trillion, six hundred forty-seven billion, forty-five million, three hundred fifty-seven thousand, three hundred seven".