261777516403523 has 8 divisors (see below), whose sum is σ = 261856400186640. Its totient is φ = 261698635404000.

The previous prime is 261777516403493. The next prime is 261777516403547. The reversal of 261777516403523 is 325304615777162.

It is a happy number.

261777516403523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 261777516403523 - 2²² = 261777512209219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261777516403553) 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, 195751661 + ... + 197084417.

It is an arithmetic number, because the mean of its divisors is an integer number (32732050023330).

Almost surely, 2^{261777516403523} is an apocalyptic number.

261777516403523 is a deficient number, since it is larger than the sum of its proper divisors (78883783117).

261777516403523 is a wasteful number, since it uses less digits than its factorization.

261777516403523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391797.

The product of its (nonzero) digits is 44452800, while the sum is 59.

The spelling of 261777516403523 in words is "two hundred sixty-one trillion, seven hundred seventy-seven billion, five hundred sixteen million, four hundred three thousand, five hundred twenty-three".