12440636757 has 6 divisors (see below), whose sum is σ = 17969808662. Its totient is φ = 8293757832.

The previous prime is 12440636699. The next prime is 12440636759. The reversal of 12440636757 is 75763604421.

12440636757 is a `hidden beast` number, since 1 + 2 + 4 + 4 + 0 + 636 + 7 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8461424196 + 3979212561 = 91986^2 + 63081^2 .

It is not a de Polignac number, because 12440636757 - 2¹¹ = 12440634709 is a prime.

It is a super-4 number, since 4×12440636757⁴ (a number of 41 digits) contains 4444 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 (12440636759) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 691146478 + ... + 691146495.

Almost surely, 2^12440636757 is an apocalyptic number.

It is an amenable number.

12440636757 is a deficient number, since it is larger than the sum of its proper divisors (5529171905).

12440636757 is a wasteful number, since it uses less digits than its factorization.

12440636757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382292979 (or 1382292976 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The spelling of 12440636757 in words is "twelve billion, four hundred forty million, six hundred thirty-six thousand, seven hundred fifty-seven".