11540640394451 has 8 divisors (see below), whose sum is σ = 13510993632864. Its totient is φ = 9650709737280.

The previous prime is 11540640394391. The next prime is 11540640394489. The reversal of 11540640394451 is 15449304604511.

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 11540640394451 - 2²² = 11540636200147 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11540640394396 and 11540640394405.

It is not an unprimeable number, because it can be changed into a prime (11540640394351) 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, 20105645000 + ... + 20105645573.

It is an arithmetic number, because the mean of its divisors is an integer number (1688874204108).

Almost surely, 2^{11540640394451} is an apocalyptic number.

11540640394451 is a deficient number, since it is larger than the sum of its proper divisors (1970353238413).

11540640394451 is an equidigital number, since it uses as much as digits as its factorization.

11540640394451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40211290621.

The product of its (nonzero) digits is 1036800, while the sum is 47.

Adding to 11540640394451 its reverse (15449304604511), we get a palindrome (26989944998962).

The spelling of 11540640394451 in words is "eleven trillion, five hundred forty billion, six hundred forty million, three hundred ninety-four thousand, four hundred fifty-one".