1641668472 has 80 divisors (see below), whose sum is σ = 4641361560. Its totient is φ = 542085696.

The previous prime is 1641668471. The next prime is 1641668473. The reversal of 1641668472 is 2748661461.

1641668472 is a `hidden beast` number, since 16 + 4 + 166 + 8 + 472 = 666.

It is an interprime number because it is at equal distance from previous prime (1641668471) and next prime (1641668473).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641668471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 57498 + ... + 81174.

Almost surely, 2^1641668472 is an apocalyptic number.

1641668472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1641668472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2320680780).

1641668472 is an abundant number, since it is smaller than the sum of its proper divisors (2999693088).

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

1641668472 is a wasteful number, since it uses less digits than its factorization.

1641668472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23802 (or 23789 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 1641668472 is about 40517.5082155850. The cubic root of 1641668472 is about 1179.6734881345.

The spelling of 1641668472 in words is "one billion, six hundred forty-one million, six hundred sixty-eight thousand, four hundred seventy-two".