1868666544 has 40 divisors (see below), whose sum is σ = 5363766320. Its totient is φ = 622888704.

The previous prime is 1868666543. The next prime is 1868666551. The reversal of 1868666544 is 4456668681.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1868666543) 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, 2162377 + ... + 2163240.

It is an arithmetic number, because the mean of its divisors is an integer number (134094158).

Almost surely, 2^1868666544 is an apocalyptic number.

It is an amenable number.

1868666544 is an abundant number, since it is smaller than the sum of its proper divisors (3495099776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1868666544 is a wasteful number, since it uses less digits than its factorization.

1868666544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4325634 (or 4325622 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 54.

The square root of 1868666544 is about 43228.0758766800. The cubic root of 1868666544 is about 1231.7160579971.

The spelling of 1868666544 in words is "one billion, eight hundred sixty-eight million, six hundred sixty-six thousand, five hundred forty-four".