1187666818 has 16 divisors (see below), whose sum is σ = 2031394680. Its totient is φ = 515909376.

The previous prime is 1187666797. The next prime is 1187666827. The reversal of 1187666818 is 8186667811.

It can be written as a sum of positive squares in 4 ways, for example, as 1146025609 + 41641209 = 33853^2 + 6453^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1343073 + ... + 1343956.

Almost surely, 2^1187666818 is an apocalyptic number.

1187666818 is a deficient number, since it is larger than the sum of its proper divisors (843727862).

1187666818 is a wasteful number, since it uses less digits than its factorization.

1187666818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687061.

The product of its digits is 774144, while the sum is 52.

The square root of 1187666818 is about 34462.5422451682. The cubic root of 1187666818 is about 1059.0054805222.

The spelling of 1187666818 in words is "one billion, one hundred eighty-seven million, six hundred sixty-six thousand, eight hundred eighteen".