1641100660 has 12 divisors (see below), whose sum is σ = 3446311428. Its totient is φ = 656440256.

The previous prime is 1641100631. The next prime is 1641100673. The reversal of 1641100660 is 660011461.

It can be written as a sum of positive squares in 2 ways, for example, as 799984656 + 841116004 = 28284^2 + 29002^2 .

It is a super-2 number, since 2×1641100660² = 5386422752504871200, which contains 22 as substring.

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, 41027497 + ... + 41027536.

It is an arithmetic number, because the mean of its divisors is an integer number (287192619).

Almost surely, 2^1641100660 is an apocalyptic number.

1641100660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641100660 is an abundant number, since it is smaller than the sum of its proper divisors (1805210768).

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

1641100660 is a wasteful number, since it uses less digits than its factorization.

1641100660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82055042 (or 82055040 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1641100660 is about 40510.5006140383. The cubic root of 1641100660 is about 1179.5374659483.

The spelling of 1641100660 in words is "one billion, six hundred forty-one million, one hundred thousand, six hundred sixty".