1646661522 has 32 divisors (see below), whose sum is σ = 3676273920. Its totient is φ = 487383120.

The previous prime is 1646661521. The next prime is 1646661539. The reversal of 1646661522 is 2251666461.

It is a super-2 number, since 2×1646661522² = 5422988336070712968, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1646661521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287272 + ... + 292947.

It is an arithmetic number, because the mean of its divisors is an integer number (114883560).

Almost surely, 2^1646661522 is an apocalyptic number.

1646661522 is an abundant number, since it is smaller than the sum of its proper divisors (2029612398).

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

1646661522 is a wasteful number, since it uses less digits than its factorization.

1646661522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580278.

The product of its digits is 103680, while the sum is 39.

The square root of 1646661522 is about 40579.0773921734. The cubic root of 1646661522 is about 1180.8682497103.

The spelling of 1646661522 in words is "one billion, six hundred forty-six million, six hundred sixty-one thousand, five hundred twenty-two".