1661018630 has 16 divisors (see below), whose sum is σ = 2995931664. Its totient is φ = 663052320.

The previous prime is 1661018621. The next prime is 1661018633. The reversal of 1661018630 is 368101661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661018633) 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, 164237 + ... + 174056.

It is an arithmetic number, because the mean of its divisors is an integer number (187245729).

Almost surely, 2^1661018630 is an apocalyptic number.

1661018630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661018630 is a deficient number, since it is larger than the sum of its proper divisors (1334913034).

1661018630 is a wasteful number, since it uses less digits than its factorization.

1661018630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338791.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1661018630 is about 40755.5963028392. The cubic root of 1661018630 is about 1184.2902881747.

The spelling of 1661018630 in words is "one billion, six hundred sixty-one million, eighteen thousand, six hundred thirty".