263401551378 has 64 divisors (see below), whose sum is σ = 690535587840. Its totient is φ = 72829918800.

The previous prime is 263401551353. The next prime is 263401551379. The reversal of 263401551378 is 873155104362.

It is a happy number.

263401551378 is a `hidden beast` number, since 2 + 63 + 4 + 0 + 1 + 5 + 513 + 78 = 666.

It is not an unprimeable number, because it can be changed into a prime (263401551379) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11227468 + ... + 11250903.

It is an arithmetic number, because the mean of its divisors is an integer number (10789618560).

Almost surely, 2^263401551378 is an apocalyptic number.

263401551378 is an abundant number, since it is smaller than the sum of its proper divisors (427134036462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

263401551378 is a wasteful number, since it uses less digits than its factorization.

263401551378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22478420 (or 22478414 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 263401551378 in words is "two hundred sixty-three billion, four hundred one million, five hundred fifty-one thousand, three hundred seventy-eight".