11640893797 has 8 divisors (see below), whose sum is σ = 12540611160. Its totient is φ = 10741785600.

The previous prime is 11640893779. The next prime is 11640893807. The reversal of 11640893797 is 79739804611.

It can be written as a sum of positive squares in 4 ways, for example, as 857476 + 11640036321 = 926^2 + 107889^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-11640893797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11640893597) 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, 112204 + ... + 189397.

It is an arithmetic number, because the mean of its divisors is an integer number (1567576395).

Almost surely, 2^11640893797 is an apocalyptic number.

It is an amenable number.

11640893797 is a deficient number, since it is larger than the sum of its proper divisors (899717363).

11640893797 is a wasteful number, since it uses less digits than its factorization.

11640893797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304583.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 11640893797 in words is "eleven billion, six hundred forty million, eight hundred ninety-three thousand, seven hundred ninety-seven".