1646586841636 has 243 divisors, whose sum is σ = 3485415699507. Its totient is φ = 679990164480.

The previous prime is 1646586841583. The next prime is 1646586841667. The reversal of 1646586841636 is 6361486856461.

It is a happy number.

The square root of 1646586841636 is 1283194.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 207930528036 + 1438656313600 = 455994^2 + 1199440^2 .

It is a super-2 number, since 2×1646586841636² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 80 ways as a sum of consecutive naturals, for example, 22555984096 + ... + 22555984168.

Almost surely, 2^{1646586841636} is an apocalyptic number.

1646586841636 is the 1283194-th square number.

It is an amenable number.

1646586841636 is an abundant number, since it is smaller than the sum of its proper divisors (1838828857871).

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

1646586841636 is a wasteful number, since it uses less digits than its factorization.

1646586841636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 150 counting only the distinct ones).

The product of its digits is 119439360, while the sum is 64.

Multiplying 1646586841636 by its sum of digits (64), we get a square (105381557864704 = 10265552²).

The spelling of 1646586841636 in words is "one trillion, six hundred forty-six billion, five hundred eighty-six million, eight hundred forty-one thousand, six hundred thirty-six".