1263888138820 has 12 divisors (see below), whose sum is σ = 2654165091564. Its totient is φ = 505555255520.

The previous prime is 1263888138803. The next prime is 1263888138839. The reversal of 1263888138820 is 288318883621.

It can be written as a sum of positive squares in 2 ways, for example, as 865376225536 + 398511913284 = 930256^2 + 631278^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31597203451 + ... + 31597203490.

It is an arithmetic number, because the mean of its divisors is an integer number (221180424297).

Almost surely, 2^{1263888138820} is an apocalyptic number.

1263888138820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263888138820 is an abundant number, since it is smaller than the sum of its proper divisors (1390276952744).

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

1263888138820 is a wasteful number, since it uses less digits than its factorization.

1263888138820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63194406950 (or 63194406948 counting only the distinct ones).

The product of its (nonzero) digits is 7077888, while the sum is 58.

The spelling of 1263888138820 in words is "one trillion, two hundred sixty-three billion, eight hundred eighty-eight million, one hundred thirty-eight thousand, eight hundred twenty".