2071663640 has 32 divisors (see below), whose sum is σ = 4679836560. Its totient is φ = 825360000.

The previous prime is 2071663579. The next prime is 2071663661. The reversal of 2071663640 is 463661702.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2071663640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93131 + ... + 113210.

Almost surely, 2^2071663640 is an apocalyptic number.

2071663640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2071663640 is an abundant number, since it is smaller than the sum of its proper divisors (2608172920).

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

2071663640 is a wasteful number, since it uses less digits than its factorization.

2071663640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206603 (or 206599 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 2071663640 is about 45515.5318545219. The cubic root of 2071663640 is about 1274.7932285476.

The spelling of 2071663640 in words is "two billion, seventy-one million, six hundred sixty-three thousand, six hundred forty".