263525146561 has 4 divisors (see below), whose sum is σ = 263539234224. Its totient is φ = 263511058900.

The previous prime is 263525146523. The next prime is 263525146597. The reversal of 263525146561 is 165641525362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 263525146561 - 2³¹ = 261377662913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263525146501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7015735 + ... + 7053196.

It is an arithmetic number, because the mean of its divisors is an integer number (65884808556).

Almost surely, 2^263525146561 is an apocalyptic number.

It is an amenable number.

263525146561 is a deficient number, since it is larger than the sum of its proper divisors (14087663).

263525146561 is a wasteful number, since it uses less digits than its factorization.

263525146561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14087662.

The product of its digits is 1296000, while the sum is 46.

The spelling of 263525146561 in words is "two hundred sixty-three billion, five hundred twenty-five million, one hundred forty-six thousand, five hundred sixty-one".