261665452463 has 8 divisors (see below), whose sum is σ = 277438648032. Its totient is φ = 245934602496.

The previous prime is 261665452453. The next prime is 261665452547. The reversal of 261665452463 is 364254566162.

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 261665452463 - 2¹² = 261665448367 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 (261665452403) 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, 10573670 + ... + 10598387.

It is an arithmetic number, because the mean of its divisors is an integer number (34679831004).

Almost surely, 2^261665452463 is an apocalyptic number.

261665452463 is a deficient number, since it is larger than the sum of its proper divisors (15773195569).

261665452463 is a wasteful number, since it uses less digits than its factorization.

261665452463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21172801.

The product of its digits is 6220800, while the sum is 50.

The spelling of 261665452463 in words is "two hundred sixty-one billion, six hundred sixty-five million, four hundred fifty-two thousand, four hundred sixty-three".