1661084603 has 8 divisors (see below), whose sum is σ = 1768515840. Its totient is φ = 1554733440.

The previous prime is 1661084599. The next prime is 1661084609. The reversal of 1661084603 is 3064801661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1661084603 - 2² = 1661084599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661084609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266843 + ... + 272996.

It is an arithmetic number, because the mean of its divisors is an integer number (221064480).

Almost surely, 2^1661084603 is an apocalyptic number.

1661084603 is a deficient number, since it is larger than the sum of its proper divisors (107431237).

1661084603 is a wasteful number, since it uses less digits than its factorization.

1661084603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540037.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 1661084603 is about 40756.4056683118. The cubic root of 1661084603 is about 1184.3059673384.

The spelling of 1661084603 in words is "one billion, six hundred sixty-one million, eighty-four thousand, six hundred three".