2001650566521 has 32 divisors (see below), whose sum is σ = 2683587456000. Its totient is φ = 1327099733568.

The previous prime is 2001650566499. The next prime is 2001650566579. The reversal of 2001650566521 is 1256650561002.

It is a happy number.

It is not a de Polignac number, because 2001650566521 - 2⁶ = 2001650566457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001650566521.

It is not an unprimeable number, because it can be changed into a prime (2001650566021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1035514071 + ... + 1035516003.

It is an arithmetic number, because the mean of its divisors is an integer number (83862108000).

Almost surely, 2^{2001650566521} is an apocalyptic number.

It is an amenable number.

2001650566521 is a deficient number, since it is larger than the sum of its proper divisors (681936889479).

2001650566521 is a wasteful number, since it uses less digits than its factorization.

2001650566521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4413.

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 2001650566521 in words is "two trillion, one billion, six hundred fifty million, five hundred sixty-six thousand, five hundred twenty-one".