263237542741561 has 4 divisors (see below), whose sum is σ = 263250321904000. Its totient is φ = 263224763579124.

The previous prime is 263237542741489. The next prime is 263237542741643. The reversal of 263237542741561 is 165147245732362.

263237542741561 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263237542741561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 263237542741496 and 263237542741505.

It is not an unprimeable number, because it can be changed into a prime (263237542771561) 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, 6389550321 + ... + 6389591518.

It is an arithmetic number, because the mean of its divisors is an integer number (65812580476000).

Almost surely, 2^{263237542741561} is an apocalyptic number.

It is an amenable number.

263237542741561 is a deficient number, since it is larger than the sum of its proper divisors (12779162439).

263237542741561 is a wasteful number, since it uses less digits than its factorization.

263237542741561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12779162438.

The product of its digits is 50803200, while the sum is 58.

The spelling of 263237542741561 in words is "two hundred sixty-three trillion, two hundred thirty-seven billion, five hundred forty-two million, seven hundred forty-one thousand, five hundred sixty-one".