1868815664 has 10 divisors (see below), whose sum is σ = 3620830380. Its totient is φ = 934407824.

The previous prime is 1868815621. The next prime is 1868815693. The reversal of 1868815664 is 4665188681.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58400474 + ... + 58400505.

It is an arithmetic number, because the mean of its divisors is an integer number (362083038).

Almost surely, 2^1868815664 is an apocalyptic number.

It is an amenable number.

1868815664 is a deficient number, since it is larger than the sum of its proper divisors (1752014716).

1868815664 is a wasteful number, since it uses less digits than its factorization.

1868815664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116800987 (or 116800981 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 53.

The square root of 1868815664 is about 43229.8006472387. The cubic root of 1868815664 is about 1231.7488208628.

The spelling of 1868815664 in words is "one billion, eight hundred sixty-eight million, eight hundred fifteen thousand, six hundred sixty-four".