1663746733 has 12 divisors (see below), whose sum is σ = 1891810620. Its totient is φ = 1460338880.

The previous prime is 1663746697. The next prime is 1663746737. The reversal of 1663746733 is 3376473661.

It can be written as a sum of positive squares in 2 ways, for example, as 1176352804 + 487393929 = 34298^2 + 22077^2 .

It is not a de Polignac number, because 1663746733 - 2²⁵ = 1630192301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663746737) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233560 + ... + 240577.

It is an arithmetic number, because the mean of its divisors is an integer number (157650885).

Almost surely, 2^1663746733 is an apocalyptic number.

It is an amenable number.

1663746733 is a deficient number, since it is larger than the sum of its proper divisors (228063887).

1663746733 is a wasteful number, since it uses less digits than its factorization.

1663746733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474188 (or 474177 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 46.

The square root of 1663746733 is about 40789.0516315347. The cubic root of 1663746733 is about 1184.9383039205.

The spelling of 1663746733 in words is "one billion, six hundred sixty-three million, seven hundred forty-six thousand, seven hundred thirty-three".