1661204124 has 36 divisors (see below), whose sum is σ = 4420164840. Its totient is φ = 524590560.

The previous prime is 1661204119. The next prime is 1661204131. The reversal of 1661204124 is 4214021661.

1661204124 is a `hidden beast` number, since 1 + 6 + 612 + 0 + 41 + 2 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1213647 + ... + 1215014.

Almost surely, 2^1661204124 is an apocalyptic number.

It is an amenable number.

1661204124 is an abundant number, since it is smaller than the sum of its proper divisors (2758960716).

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

1661204124 is a wasteful number, since it uses less digits than its factorization.

1661204124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2428690 (or 2428685 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1661204124 is about 40757.8719267824. The cubic root of 1661204124 is about 1184.3343716790.

Adding to 1661204124 its reverse (4214021661), we get a palindrome (5875225785).

The spelling of 1661204124 in words is "one billion, six hundred sixty-one million, two hundred four thousand, one hundred twenty-four".