11501378649 has 20 divisors (see below), whose sum is σ = 17184061840. Its totient is φ = 7666251480.

The previous prime is 11501378633. The next prime is 11501378719. The reversal of 11501378649 is 94687310511.

11501378649 is a `hidden beast` number, since 11 + 501 + 3 + 78 + 64 + 9 = 666.

It is not a de Polignac number, because 11501378649 - 2⁴ = 11501378633 is a prime.

It is a super-3 number, since 3×11501378649³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11501378549) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 728562 + ... + 744180.

It is an arithmetic number, because the mean of its divisors is an integer number (859203092).

Almost surely, 2^11501378649 is an apocalyptic number.

It is an amenable number.

11501378649 is a deficient number, since it is larger than the sum of its proper divisors (5682683191).

11501378649 is an equidigital number, since it uses as much as digits as its factorization.

11501378649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24722 (or 24713 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 11501378649 in words is "eleven billion, five hundred one million, three hundred seventy-eight thousand, six hundred forty-nine".