11139640897 has 16 divisors (see below), whose sum is σ = 13925653632. Its totient is φ = 8656945920.

The previous prime is 11139640877. The next prime is 11139640943. The reversal of 11139640897 is 79804693111.

It is a de Polignac number, because none of the positive numbers 2^k-11139640897 is a prime.

It is a super-2 number, since 2×11139640897² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11139640897.

It is not an unprimeable number, because it can be changed into a prime (11139640817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165208 + ... + 222649.

It is an arithmetic number, because the mean of its divisors is an integer number (870353352).

Almost surely, 2^11139640897 is an apocalyptic number.

It is an amenable number.

11139640897 is a deficient number, since it is larger than the sum of its proper divisors (2786012735).

11139640897 is a wasteful number, since it uses less digits than its factorization.

11139640897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388248.

The product of its (nonzero) digits is 326592, while the sum is 49.

The spelling of 11139640897 in words is "eleven billion, one hundred thirty-nine million, six hundred forty thousand, eight hundred ninety-seven".