2051664636 has 24 divisors (see below), whose sum is σ = 5471105920. Its totient is φ = 586189872.

The previous prime is 2051664617. The next prime is 2051664673. The reversal of 2051664636 is 6364661502.

It is a super-2 number, since 2×2051664636² = 8418655557226024992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2051664594 and 2051664603.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 12212206 + ... + 12212373.

Almost surely, 2^2051664636 is an apocalyptic number.

It is an amenable number.

2051664636 is an abundant number, since it is smaller than the sum of its proper divisors (3419441284).

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

2051664636 is a wasteful number, since it uses less digits than its factorization.

2051664636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24424593 (or 24424591 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 2051664636 is about 45295.3047897903. The cubic root of 2051664636 is about 1270.6778442757.

The spelling of 2051664636 in words is "two billion, fifty-one million, six hundred sixty-four thousand, six hundred thirty-six".