261451114446563 has 16 divisors (see below), whose sum is σ = 261791079490176. Its totient is φ = 261111408874560.

The previous prime is 261451114446553. The next prime is 261451114446593. The reversal of 261451114446563 is 365644411154162.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 261451114446563 - 2¹⁰ = 261451114445539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261451114446503) 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, 33722569895 + ... + 33722577647.

It is an arithmetic number, because the mean of its divisors is an integer number (16361942468136).

Almost surely, 2^{261451114446563} is an apocalyptic number.

261451114446563 is a deficient number, since it is larger than the sum of its proper divisors (339965043613).

261451114446563 is a wasteful number, since it uses less digits than its factorization.

261451114446563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19394.

The product of its digits is 8294400, while the sum is 53.

The spelling of 261451114446563 in words is "two hundred sixty-one trillion, four hundred fifty-one billion, one hundred fourteen million, four hundred forty-six thousand, five hundred sixty-three".