1661202152 has 32 divisors (see below), whose sum is σ = 3147049800. Its totient is φ = 822011904.

The previous prime is 1661202149. The next prime is 1661202211. The reversal of 1661202152 is 2512021661.

It can be written as a sum of positive squares in 4 ways, for example, as 288796036 + 1372406116 = 16994^2 + 37046^2 .

It is a super-2 number, since 2×1661202152² = 5519185179618862208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1001708 + ... + 1003364.

Almost surely, 2^1661202152 is an apocalyptic number.

It is an amenable number.

1661202152 is a deficient number, since it is larger than the sum of its proper divisors (1485847648).

1661202152 is a wasteful number, since it uses less digits than its factorization.

1661202152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885 (or 2881 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1661202152 is about 40757.8477351295. The cubic root of 1661202152 is about 1184.3339030414. Note that the first 3 decimals are identical.

The spelling of 1661202152 in words is "one billion, six hundred sixty-one million, two hundred two thousand, one hundred fifty-two".