263240416775642 has 4 divisors (see below), whose sum is σ = 394860625163466. Its totient is φ = 131620208387820.

The previous prime is 263240416775621. The next prime is 263240416775647. The reversal of 263240416775642 is 246577614042362.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 249459312306961 + 13781104468681 = 15794281^2 + 3712291^2 .

It is not an unprimeable number, because it can be changed into a prime (263240416775647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65810104193909 + ... + 65810104193912.

Almost surely, 2^{263240416775642} is an apocalyptic number.

263240416775642 is a deficient number, since it is larger than the sum of its proper divisors (131620208387824).

263240416775642 is a wasteful number, since it uses less digits than its factorization.

263240416775642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131620208387823.

The product of its (nonzero) digits is 81285120, while the sum is 59.

The spelling of 263240416775642 in words is "two hundred sixty-three trillion, two hundred forty billion, four hundred sixteen million, seven hundred seventy-five thousand, six hundred forty-two".