2056665642 has 16 divisors (see below), whose sum is σ = 4123593792. Its totient is φ = 683844800.

The previous prime is 2056665577. The next prime is 2056665647. The reversal of 2056665642 is 2465666502.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 2056665594 and 2056665603.

It is not an unprimeable number, because it can be changed into a prime (2056665647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424998 + ... + 429809.

It is an arithmetic number, because the mean of its divisors is an integer number (257724612).

Almost surely, 2^2056665642 is an apocalyptic number.

2056665642 is an abundant number, since it is smaller than the sum of its proper divisors (2066928150).

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

2056665642 is a wasteful number, since it uses less digits than its factorization.

2056665642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855213.

The product of its (nonzero) digits is 518400, while the sum is 42.

The square root of 2056665642 is about 45350.4756535144. The cubic root of 2056665642 is about 1271.7094474512.

The spelling of 2056665642 in words is "two billion, fifty-six million, six hundred sixty-five thousand, six hundred forty-two".