1663178964 has 12 divisors (see below), whose sum is σ = 3880750944. Its totient is φ = 554392984.

The previous prime is 1663178963. The next prime is 1663178977. The reversal of 1663178964 is 4698713661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1663178964² = 5532328532584226592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663178963) 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, 69299112 + ... + 69299135.

It is an arithmetic number, because the mean of its divisors is an integer number (323395912).

Almost surely, 2^1663178964 is an apocalyptic number.

It is an amenable number.

1663178964 is an abundant number, since it is smaller than the sum of its proper divisors (2217571980).

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

1663178964 is a wasteful number, since it uses less digits than its factorization.

1663178964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138598254 (or 138598252 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 51.

The square root of 1663178964 is about 40782.0912166112. The cubic root of 1663178964 is about 1184.8034981902.

The spelling of 1663178964 in words is "one billion, six hundred sixty-three million, one hundred seventy-eight thousand, nine hundred sixty-four".