511681664091 has 16 divisors (see below), whose sum is σ = 736475927040. Its totient is φ = 314129508000.

The previous prime is 511681664057. The next prime is 511681664093. The reversal of 511681664091 is 190466186115.

It is not a de Polignac number, because 511681664091 - 2¹⁸ = 511681401947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 511681664091.

It is not an unprimeable number, because it can be changed into a prime (511681664093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15640035 + ... + 15672716.

It is an arithmetic number, because the mean of its divisors is an integer number (46029745440).

Almost surely, 2^511681664091 is an apocalyptic number.

511681664091 is a deficient number, since it is larger than the sum of its proper divisors (224794262949).

511681664091 is a wasteful number, since it uses less digits than its factorization.

511681664091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31313186.

The product of its (nonzero) digits is 311040, while the sum is 48.

The spelling of 511681664091 in words is "five hundred eleven billion, six hundred eighty-one million, six hundred sixty-four thousand, ninety-one".