999768013457 has 4 divisors (see below), whose sum is σ = 1001732194740. Its totient is φ = 997803832176.

The previous prime is 999768013427. The next prime is 999768013481. The reversal of 999768013457 is 754310867999.

It is a Cunningham number, because it is equal to 999884²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 812997968896 + 186770044561 = 901664^2 + 432169^2 .

It is a cyclic number.

It is not a de Polignac number, because 999768013457 - 2⁶ = 999768013393 is a prime.

It is a super-2 number, since 2×999768013457² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999768013427) 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 3 ways as a sum of consecutive naturals, for example, 982089878 + ... + 982090895.

It is an arithmetic number, because the mean of its divisors is an integer number (250433048685).

Almost surely, 2^999768013457 is an apocalyptic number.

It is an amenable number.

999768013457 is a deficient number, since it is larger than the sum of its proper divisors (1964181283).

999768013457 is a wasteful number, since it uses less digits than its factorization.

999768013457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964181282.

The product of its (nonzero) digits is 102876480, while the sum is 68.

The spelling of 999768013457 in words is "nine hundred ninety-nine billion, seven hundred sixty-eight million, thirteen thousand, four hundred fifty-seven".