1661201552 has 20 divisors (see below), whose sum is σ = 3219226620. Its totient is φ = 830433408.

The previous prime is 1661201539. The next prime is 1661201567. The reversal of 1661201552 is 2551021661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1029383056 + 631818496 = 32084^2 + 25136^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123074 + ... + 135902.

It is an arithmetic number, because the mean of its divisors is an integer number (160961331).

Almost surely, 2^1661201552 is an apocalyptic number.

It is an amenable number.

1661201552 is a deficient number, since it is larger than the sum of its proper divisors (1558025068).

1661201552 is a wasteful number, since it uses less digits than its factorization.

1661201552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20930 (or 20924 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1661201552 is about 40757.8403745831. The cubic root of 1661201552 is about 1184.3337604538. Note that the first 3 decimals are identical.

The spelling of 1661201552 in words is "one billion, six hundred sixty-one million, two hundred one thousand, five hundred fifty-two".