1661044040 has 32 divisors (see below), whose sum is σ = 3739538880. Its totient is φ = 664028352.

The previous prime is 1661044037. The next prime is 1661044067. The reversal of 1661044040 is 404401661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62639 + ... + 85121.

It is an arithmetic number, because the mean of its divisors is an integer number (116860590).

Almost surely, 2^1661044040 is an apocalyptic number.

1661044040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661044040 is an abundant number, since it is smaller than the sum of its proper divisors (2078494840).

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

1661044040 is a wasteful number, since it uses less digits than its factorization.

1661044040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24341 (or 24337 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1661044040 is about 40755.9080379765. The cubic root of 1661044040 is about 1184.2963271724.

The spelling of 1661044040 in words is "one billion, six hundred sixty-one million, forty-four thousand, forty".