263620640642 has 8 divisors (see below), whose sum is σ = 395471221500. Its totient is φ = 131796900144.

The previous prime is 263620640629. The next prime is 263620640671. The reversal of 263620640642 is 246046026362.

263620640642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 262911537001 + 709103641 = 512749^2 + 26629^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 263620640642.

It is an unprimeable number.

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, 6685517 + ... + 6724832.

Almost surely, 2^263620640642 is an apocalyptic number.

263620640642 is a deficient number, since it is larger than the sum of its proper divisors (131850580858).

263620640642 is a wasteful number, since it uses less digits than its factorization.

263620640642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13420180.

The product of its (nonzero) digits is 497664, while the sum is 41.

The spelling of 263620640642 in words is "two hundred sixty-three billion, six hundred twenty million, six hundred forty thousand, six hundred forty-two".