263012323661 has 4 divisors (see below), whose sum is σ = 263033801052. Its totient is φ = 262990846272.

The previous prime is 263012323649. The next prime is 263012323687. The reversal of 263012323661 is 166323210362.

263012323661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166323210362 = 2 ⋅83161605181.

It can be written as a sum of positive squares in 2 ways, for example, as 198835728100 + 64176595561 = 445910^2 + 253331^2 .

It is a cyclic number.

It is not a de Polignac number, because 263012323661 - 2¹⁴ = 263012307277 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 (263012323961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10720316 + ... + 10744821.

It is an arithmetic number, because the mean of its divisors is an integer number (65758450263).

Almost surely, 2^263012323661 is an apocalyptic number.

It is an amenable number.

263012323661 is a deficient number, since it is larger than the sum of its proper divisors (21477391).

263012323661 is a wasteful number, since it uses less digits than its factorization.

263012323661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21477390.

The product of its (nonzero) digits is 46656, while the sum is 35.

The spelling of 263012323661 in words is "two hundred sixty-three billion, twelve million, three hundred twenty-three thousand, six hundred sixty-one".