261655437602723 has 8 divisors (see below), whose sum is σ = 265245516524448. Its totient is φ = 258065514298944.

The previous prime is 261655437602719. The next prime is 261655437602729. The reversal of 261655437602723 is 327206734556162.

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 261655437602723 - 2² = 261655437602719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261655437602729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35516615 + ... + 42246192.

It is an arithmetic number, because the mean of its divisors is an integer number (33155689565556).

Almost surely, 2^{261655437602723} is an apocalyptic number.

261655437602723 is a deficient number, since it is larger than the sum of its proper divisors (3590078921725).

261655437602723 is an equidigital number, since it uses as much as digits as its factorization.

261655437602723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77808973.

The product of its (nonzero) digits is 76204800, while the sum is 59.

The spelling of 261655437602723 in words is "two hundred sixty-one trillion, six hundred fifty-five billion, four hundred thirty-seven million, six hundred two thousand, seven hundred twenty-three".