1661605614 has 48 divisors (see below), whose sum is σ = 3650034960. Its totient is φ = 546226560.

The previous prime is 1661605609. The next prime is 1661605639. The reversal of 1661605614 is 4165061661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 747024 + ... + 749244.

It is an arithmetic number, because the mean of its divisors is an integer number (76042395).

Almost surely, 2^1661605614 is an apocalyptic number.

1661605614 is an abundant number, since it is smaller than the sum of its proper divisors (1988429346).

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

1661605614 is a wasteful number, since it uses less digits than its factorization.

1661605614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785 (or 2782 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1661605614 is about 40762.7969354410. The cubic root of 1661605614 is about 1184.4297763914.

The spelling of 1661605614 in words is "one billion, six hundred sixty-one million, six hundred five thousand, six hundred fourteen".