1661527204 has 6 divisors (see below), whose sum is σ = 2907672614. Its totient is φ = 830763600.

The previous prime is 1661527193. The next prime is 1661527237. The reversal of 1661527204 is 4027251661.

It can be written as a sum of positive squares in only one way, i.e., 1549209600 + 112317604 = 39360^2 + 10598^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1661527204.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207690897 + ... + 207690904.

Almost surely, 2^1661527204 is an apocalyptic number.

It is an amenable number.

1661527204 is a deficient number, since it is larger than the sum of its proper divisors (1246145410).

1661527204 is a wasteful number, since it uses less digits than its factorization.

1661527204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415381805 (or 415381803 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1661527204 is about 40761.8351402387. The cubic root of 1661527204 is about 1184.4111452957.

Adding to 1661527204 its reverse (4027251661), we get a palindrome (5688778865).

The spelling of 1661527204 in words is "one billion, six hundred sixty-one million, five hundred twenty-seven thousand, two hundred four".