1665762252 has 72 divisors (see below), whose sum is σ = 4932406080. Its totient is φ = 432663840.

The previous prime is 1665762209. The next prime is 1665762269. The reversal of 1665762252 is 2522675661.

It is a super-2 number, since 2×1665762252² = 5549527760376223008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122302 + ... + 135237.

It is an arithmetic number, because the mean of its divisors is an integer number (68505640).

Almost surely, 2^1665762252 is an apocalyptic number.

1665762252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1665762252 is an abundant number, since it is smaller than the sum of its proper divisors (3266643828).

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

1665762252 is a wasteful number, since it uses less digits than its factorization.

1665762252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257571 (or 257562 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 1665762252 is about 40813.7507710330. The cubic root of 1665762252 is about 1185.4166022613.

The spelling of 1665762252 in words is "one billion, six hundred sixty-five million, seven hundred sixty-two thousand, two hundred fifty-two".