1663673004 has 72 divisors (see below), whose sum is σ = 4811308320. Its totient is φ = 474826752.

The previous prime is 1663672981. The next prime is 1663673009. The reversal of 1663673004 is 4003763661.

It is a happy number.

1663673004 is a `hidden beast` number, since 16 + 636 + 7 + 3 + 0 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1663673004.

It is not an unprimeable number, because it can be changed into a prime (1663673009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 276492 + ... + 282444.

Almost surely, 2^1663673004 is an apocalyptic number.

1663673004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1663673004 is an abundant number, since it is smaller than the sum of its proper divisors (3147635316).

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

1663673004 is a wasteful number, since it uses less digits than its factorization.

1663673004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7079 (or 7074 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 1663673004 is about 40788.1478373314. The cubic root of 1663673004 is about 1184.9208001332.

The spelling of 1663673004 in words is "one billion, six hundred sixty-three million, six hundred seventy-three thousand, four".