2001656019 has 16 divisors (see below), whose sum is σ = 3005420544. Its totient is φ = 1173991200.

The previous prime is 2001656003. The next prime is 2001656047. The reversal of 2001656019 is 9106561002.

It is not a de Polignac number, because 2001656019 - 2⁴ = 2001656003 is a prime.

It is a super-2 number, since 2×2001656019² = 8013253636797856722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2001656219) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 977304 + ... + 979349.

It is an arithmetic number, because the mean of its divisors is an integer number (187838784).

Almost surely, 2^2001656019 is an apocalyptic number.

2001656019 is a deficient number, since it is larger than the sum of its proper divisors (1003764525).

2001656019 is a wasteful number, since it uses less digits than its factorization.

2001656019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956698.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 2001656019 is about 44739.8705742428. The cubic root of 2001656019 is about 1260.2686961606.

The spelling of 2001656019 in words is "two billion, one million, six hundred fifty-six thousand, nineteen".