12704987791 has 16 divisors (see below), whose sum is σ = 13800634848. Its totient is φ = 11648896000.

The previous prime is 12704987741. The next prime is 12704987807. The reversal of 12704987791 is 19778940721.

It is a cyclic number.

It is not a de Polignac number, because 12704987791 - 2⁷ = 12704987663 is a prime.

It is a super-2 number, since 2×12704987791² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12704987741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475596 + ... + 501598.

It is an arithmetic number, because the mean of its divisors is an integer number (862539678).

Almost surely, 2^12704987791 is an apocalyptic number.

12704987791 is a deficient number, since it is larger than the sum of its proper divisors (1095647057).

12704987791 is a wasteful number, since it uses less digits than its factorization.

12704987791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26762.

The product of its (nonzero) digits is 1778112, while the sum is 55.

It can be divided in two parts, 127049 and 87791, that added together give a triangular number (214840 = T₆₅₅).

The spelling of 12704987791 in words is "twelve billion, seven hundred four million, nine hundred eighty-seven thousand, seven hundred ninety-one".