11218870657 has 4 divisors (see below), whose sum is σ = 11236211136. Its totient is φ = 11201530180.

The previous prime is 11218870613. The next prime is 11218870687. The reversal of 11218870657 is 75607881211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75607881211 = 19 ⋅3979362169.

It is a cyclic number.

It is not a de Polignac number, because 11218870657 - 2¹⁹ = 11218346369 is a prime.

It is a super-2 number, since 2×11218870657² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11218870687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8669269 + ... + 8670562.

It is an arithmetic number, because the mean of its divisors is an integer number (2809052784).

Almost surely, 2^11218870657 is an apocalyptic number.

It is an amenable number.

11218870657 is a deficient number, since it is larger than the sum of its proper divisors (17340479).

11218870657 is an equidigital number, since it uses as much as digits as its factorization.

11218870657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17340478.

The product of its (nonzero) digits is 188160, while the sum is 46.

The spelling of 11218870657 in words is "eleven billion, two hundred eighteen million, eight hundred seventy thousand, six hundred fifty-seven".