1616641663 has 36 divisors (see below), whose sum is σ = 2053772400. Its totient is φ = 1271441808.

The previous prime is 1616641651. The next prime is 1616641667. The reversal of 1616641663 is 3661466161.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 1616641663 - 2¹³ = 1616633471 is a prime.

It is a super-2 number, since 2×1616641663² = 5227060533094811138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616641667) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9680406 + ... + 9680572.

Almost surely, 2^1616641663 is an apocalyptic number.

1616641663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1616641663 is a deficient number, since it is larger than the sum of its proper divisors (437130737).

1616641663 is an frugal number, since it uses more digits than its factorization.

1616641663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381 (or 187 counting only the distinct ones).

The product of its digits is 93312, while the sum is 40.

The square root of 1616641663 is about 40207.4826742486. The cubic root of 1616641663 is about 1173.6481602260.

The spelling of 1616641663 in words is "one billion, six hundred sixteen million, six hundred forty-one thousand, six hundred sixty-three".