1661450540 has 24 divisors (see below), whose sum is σ = 3640744800. Its totient is φ = 635685248.

The previous prime is 1661450533. The next prime is 1661450569. The reversal of 1661450540 is 450541661.

It is a junction number, because it is equal to n+sod(n) for n = 1661450497 and 1661450506.

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, 1805465 + ... + 1806384.

It is an arithmetic number, because the mean of its divisors is an integer number (151697700).

Almost surely, 2^1661450540 is an apocalyptic number.

1661450540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661450540 is an abundant number, since it is smaller than the sum of its proper divisors (1979294260).

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

1661450540 is a wasteful number, since it uses less digits than its factorization.

1661450540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611881 (or 3611879 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1661450540 is about 40760.8947399343. The cubic root of 1661450540 is about 1184.3929285024.

The spelling of 1661450540 in words is "one billion, six hundred sixty-one million, four hundred fifty thousand, five hundred forty".