1868664494 has 8 divisors (see below), whose sum is σ = 2808706968. Its totient is φ = 932428840.

The previous prime is 1868664491. The next prime is 1868664527. The reversal of 1868664494 is 4944668681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1868664494² = 6983813982272552072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868664491) 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, 950477 + ... + 952440.

It is an arithmetic number, because the mean of its divisors is an integer number (351088371).

Almost surely, 2^1868664494 is an apocalyptic number.

1868664494 is a deficient number, since it is larger than the sum of its proper divisors (940042474).

1868664494 is a wasteful number, since it uses less digits than its factorization.

1868664494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903410.

The product of its digits is 7962624, while the sum is 56.

The square root of 1868664494 is about 43228.0521652318. The cubic root of 1868664494 is about 1231.7156075834.

The spelling of 1868664494 in words is "one billion, eight hundred sixty-eight million, six hundred sixty-four thousand, four hundred ninety-four".