11945372818 has 16 divisors (see below), whose sum is σ = 18584544024. Its totient is φ = 5753721600.

The previous prime is 11945372797. The next prime is 11945372819. The reversal of 11945372818 is 81827354911.

It can be written as a sum of positive squares in 4 ways, for example, as 11568508249 + 376864569 = 107557^2 + 19413^2 .

It is a super-2 number, since 2×11945372818² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11945372819) 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, 791655 + ... + 806602.

Almost surely, 2^11945372818 is an apocalyptic number.

11945372818 is a deficient number, since it is larger than the sum of its proper divisors (6639171206).

11945372818 is a wasteful number, since it uses less digits than its factorization.

11945372818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1598397.

The product of its digits is 483840, while the sum is 49.

The spelling of 11945372818 in words is "eleven billion, nine hundred forty-five million, three hundred seventy-two thousand, eight hundred eighteen".