1272186638763 has 4 divisors (see below), whose sum is σ = 1696248851688. Its totient is φ = 848124425840.

The previous prime is 1272186638759. The next prime is 1272186638791. The reversal of 1272186638763 is 3678366812721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1272186638763 - 2² = 1272186638759 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1272186638697 and 1272186638706.

It is not an unprimeable number, because it can be changed into a prime (1272186638713) 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 3 ways as a sum of consecutive naturals, for example, 212031106458 + ... + 212031106463.

It is an arithmetic number, because the mean of its divisors is an integer number (424062212922).

Almost surely, 2^{1272186638763} is an apocalyptic number.

1272186638763 is a deficient number, since it is larger than the sum of its proper divisors (424062212925).

1272186638763 is an equidigital number, since it uses as much as digits as its factorization.

1272186638763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424062212924.

The product of its digits is 24385536, while the sum is 60.

The spelling of 1272186638763 in words is "one trillion, two hundred seventy-two billion, one hundred eighty-six million, six hundred thirty-eight thousand, seven hundred sixty-three".