512491978781 has 8 divisors (see below), whose sum is σ = 544864320000. Its totient is φ = 480960477712.

The previous prime is 512491978769. The next prime is 512491978783. The reversal of 512491978781 is 187879194215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 512491978781 - 2²⁶ = 512424869917 is a prime.

It is a super-2 number, since 2×512491978781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512491978783) 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 7 ways as a sum of consecutive naturals, for example, 210208781 + ... + 210211218.

It is an arithmetic number, because the mean of its divisors is an integer number (68108040000).

Almost surely, 2^512491978781 is an apocalyptic number.

It is an amenable number.

512491978781 is a deficient number, since it is larger than the sum of its proper divisors (32372341219).

512491978781 is a wasteful number, since it uses less digits than its factorization.

512491978781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420420075.

The product of its digits is 10160640, while the sum is 62.

The spelling of 512491978781 in words is "five hundred twelve billion, four hundred ninety-one million, nine hundred seventy-eight thousand, seven hundred eighty-one".