1663672747 has 8 divisors (see below), whose sum is σ = 1816246512. Its totient is φ = 1511320800.

The previous prime is 1663672741. The next prime is 1663672757. The reversal of 1663672747 is 7472763661.

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

It is not a de Polignac number, because 1663672747 - 2²³ = 1655284139 is a prime.

It is a super-2 number, since 2×1663672747² = 5535614018221052018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1663672747.

It is not an unprimeable number, because it can be changed into a prime (1663672741) 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, 39568 + ... + 69949.

It is an arithmetic number, because the mean of its divisors is an integer number (227030814).

Almost surely, 2^1663672747 is an apocalyptic number.

1663672747 is a deficient number, since it is larger than the sum of its proper divisors (152573765).

1663672747 is a wasteful number, since it uses less digits than its factorization.

1663672747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110909.

The product of its digits is 1778112, while the sum is 49.

The square root of 1663672747 is about 40788.1446869063. The cubic root of 1663672747 is about 1184.9207391187.

The spelling of 1663672747 in words is "one billion, six hundred sixty-three million, six hundred seventy-two thousand, seven hundred forty-seven".