1661633876 has 12 divisors (see below), whose sum is σ = 3323267808. Its totient is φ = 712128792.

The previous prime is 1661633867. The next prime is 1661633887. The reversal of 1661633876 is 6783361661.

1661633876 is an admirable number.

It is a super-2 number, since 2×1661633876² = 5522054275741566752, which contains 22 as substring.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1661633876.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29672006 + ... + 29672061.

It is an arithmetic number, because the mean of its divisors is an integer number (276938984).

Almost surely, 2^1661633876 is an apocalyptic number.

It is an amenable number.

1661633876 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661633876 is a wasteful number, since it uses less digits than its factorization.

1661633876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59344078 (or 59344076 counting only the distinct ones).

The product of its digits is 653184, while the sum is 47.

The square root of 1661633876 is about 40763.1435981083. The cubic root of 1661633876 is about 1184.4364916159.

The spelling of 1661633876 in words is "one billion, six hundred sixty-one million, six hundred thirty-three thousand, eight hundred seventy-six".