11681643949 has 8 divisors (see below), whose sum is σ = 12191230080. Its totient is φ = 11172198576.

The previous prime is 11681643923. The next prime is 11681643997. The reversal of 11681643949 is 94934618611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11681643949 - 2⁹ = 11681643437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11681643896 and 11681643905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11681643349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156747 + ... + 218935.

It is an arithmetic number, because the mean of its divisors is an integer number (1523903760).

Almost surely, 2^11681643949 is an apocalyptic number.

It is an amenable number.

11681643949 is a deficient number, since it is larger than the sum of its proper divisors (509586131).

11681643949 is an equidigital number, since it uses as much as digits as its factorization.

11681643949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70379.

The product of its digits is 1119744, while the sum is 52.

The spelling of 11681643949 in words is "eleven billion, six hundred eighty-one million, six hundred forty-three thousand, nine hundred forty-nine".