1661063047 has 12 divisors (see below), whose sum is σ = 2016597040. Its totient is φ = 1340015616.

The previous prime is 1661062993. The next prime is 1661063051. The reversal of 1661063047 is 7403601661.

It is not a de Polignac number, because 1661063047 - 2²⁷ = 1526845319 is a prime.

It is a super-2 number, since 2×1661063047² = 5518260892217848418, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661063077) 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, 408522 + ... + 412567.

Almost surely, 2^1661063047 is an apocalyptic number.

1661063047 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1661063047 is a deficient number, since it is larger than the sum of its proper divisors (355533993).

1661063047 is an equidigital number, since it uses as much as digits as its factorization.

1661063047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821130 (or 821113 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 1661063047 is about 40756.1412182262. The cubic root of 1661063047 is about 1184.3008443784.

The spelling of 1661063047 in words is "one billion, six hundred sixty-one million, sixty-three thousand, forty-seven".