1661725452 has 24 divisors (see below), whose sum is σ = 4105439856. Its totient is φ = 521325568.

The previous prime is 1661725441. The next prime is 1661725517. The reversal of 1661725452 is 2545271661.

It is a super-2 number, since 2×1661725452² = 5522662955649208608, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1661725452.

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, 4072653 + ... + 4073060.

It is an arithmetic number, because the mean of its divisors is an integer number (171059994).

Almost surely, 2^1661725452 is an apocalyptic number.

1661725452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1661725452 is an abundant number, since it is smaller than the sum of its proper divisors (2443714404).

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

1661725452 is a wasteful number, since it uses less digits than its factorization.

1661725452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8145737 (or 8145735 counting only the distinct ones).

The product of its digits is 100800, while the sum is 39.

The square root of 1661725452 is about 40764.2668522322. The cubic root of 1661725452 is about 1184.4582501122.

The spelling of 1661725452 in words is "one billion, six hundred sixty-one million, seven hundred twenty-five thousand, four hundred fifty-two".