12638763770 has 32 divisors (see below), whose sum is σ = 23376392208. Its totient is φ = 4916395008.

The previous prime is 12638763743. The next prime is 12638763779. The reversal of 12638763770 is 7736783621.

It can be written as a sum of positive squares in 8 ways, for example, as 9986204761 + 2652559009 = 99931^2 + 51503^2 .

It is a super-2 number, since 2×12638763770² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12638763779) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 840962 + ... + 855858.

Almost surely, 2^12638763770 is an apocalyptic number.

12638763770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12638763770 is a deficient number, since it is larger than the sum of its proper divisors (10737628438).

12638763770 is a wasteful number, since it uses less digits than its factorization.

12638763770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17234.

The product of its (nonzero) digits is 1778112, while the sum is 50.

The spelling of 12638763770 in words is "twelve billion, six hundred thirty-eight million, seven hundred sixty-three thousand, seven hundred seventy".