263404690838 has 8 divisors (see below), whose sum is σ = 395118422688. Its totient is φ = 131698549944.

The previous prime is 263404690823. The next prime is 263404690897. The reversal of 263404690838 is 838096404362.

263404690838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×263404690838² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 263404690838.

It is a congruent number.

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, 1810181 + ... + 1950272.

It is an arithmetic number, because the mean of its divisors is an integer number (49389802836).

Almost surely, 2^263404690838 is an apocalyptic number.

263404690838 is a deficient number, since it is larger than the sum of its proper divisors (131713731850).

263404690838 is a wasteful number, since it uses less digits than its factorization.

263404690838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3795478.

The product of its (nonzero) digits is 5971968, while the sum is 53.

The spelling of 263404690838 in words is "two hundred sixty-three billion, four hundred four million, six hundred ninety thousand, eight hundred thirty-eight".