11499640551 has 40 divisors (see below), whose sum is σ = 19711004544. Its totient is φ = 6544962000.

The previous prime is 11499640507. The next prime is 11499640561. The reversal of 11499640551 is 15504699411.

11499640551 is a `hidden beast` number, since 1 + 1 + 4 + 9 + 96 + 4 + 0 + 551 = 666.

It is not a de Polignac number, because 11499640551 - 2¹⁰ = 11499639527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11499640497 and 11499640506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11499640561) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 101916 + ... + 182718.

Almost surely, 2^11499640551 is an apocalyptic number.

11499640551 is a deficient number, since it is larger than the sum of its proper divisors (8211363993).

11499640551 is an equidigital number, since it uses as much as digits as its factorization.

11499640551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81073 (or 81064 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 11499640551 in words is "eleven billion, four hundred ninety-nine million, six hundred forty thousand, five hundred fifty-one".