1667646752 has 18 divisors (see below), whose sum is σ = 3283634403. Its totient is φ = 833707872.

The previous prime is 1667646737. The next prime is 1667646781. The reversal of 1667646752 is 2576467661.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 833823376 + 833823376 = 28876^2 + 28876^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=28876.

It is a super-2 number, since 2×1667646752² = 5562091378912299008, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1667646752.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 227399 + ... + 234617.

Almost surely, 2^1667646752 is an apocalyptic number.

It is an amenable number.

1667646752 is a deficient number, since it is larger than the sum of its proper divisors (1615987651).

1667646752 is an frugal number, since it uses more digits than its factorization.

1667646752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14448 (or 7221 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 50.

The square root of 1667646752 is about 40836.8308270855. The cubic root of 1667646752 is about 1185.8634598871.

Multiplying 1667646752 by its sum of digits (50), we get a square (83382337600 = 288760²).

The spelling of 1667646752 in words is "one billion, six hundred sixty-seven million, six hundred forty-six thousand, seven hundred fifty-two".