1661455252 has 24 divisors (see below), whose sum is σ = 3015721800. Its totient is φ = 800265600.

The previous prime is 1661455223. The next prime is 1661455283. The reversal of 1661455252 is 2525541661.

It can be written as a sum of positive squares in 4 ways, for example, as 1028228356 + 633226896 = 32066^2 + 25164^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

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, 40627 + ... + 70522.

It is an arithmetic number, because the mean of its divisors is an integer number (125655075).

Almost surely, 2^1661455252 is an apocalyptic number.

It is an amenable number.

1661455252 is a deficient number, since it is larger than the sum of its proper divisors (1354266548).

1661455252 is a wasteful number, since it uses less digits than its factorization.

1661455252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111291 (or 111289 counting only the distinct ones).

The product of its digits is 72000, while the sum is 37.

The square root of 1661455252 is about 40760.9525403909. The cubic root of 1661455252 is about 1184.3940481775.

The spelling of 1661455252 in words is "one billion, six hundred sixty-one million, four hundred fifty-five thousand, two hundred fifty-two".