1661009144 has 16 divisors (see below), whose sum is σ = 3142966200. Its totient is φ = 822884832.

The previous prime is 1661009137. The next prime is 1661009173. The reversal of 1661009144 is 4419001661.

It is a happy number.

It is a super-2 number, since 2×1661009144² = 5517902752903225472, which contains 22 as substring.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1661009144.

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, 951542 + ... + 953285.

Almost surely, 2^1661009144 is an apocalyptic number.

It is an amenable number.

1661009144 is a deficient number, since it is larger than the sum of its proper divisors (1481957056).

1661009144 is a wasteful number, since it uses less digits than its factorization.

1661009144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904942 (or 1904938 counting only the distinct ones).

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

The square root of 1661009144 is about 40755.4799260173. The cubic root of 1661009144 is about 1184.2880336949.

The spelling of 1661009144 in words is "one billion, six hundred sixty-one million, nine thousand, one hundred forty-four".