999768013455 has 32 divisors (see below), whose sum is σ = 1612612915200. Its totient is φ = 528897582720.

The previous prime is 999768013427. The next prime is 999768013481. The reversal of 999768013455 is 554310867999.

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

It is not a de Polignac number, because 999768013455 - 2⁵ = 999768013423 is a prime.

It is a super-2 number, since 2×999768013455² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 499944 + ... + 1499826.

It is an arithmetic number, because the mean of its divisors is an integer number (50394153600).

Almost surely, 2^999768013455 is an apocalyptic number.

999768013455 is a deficient number, since it is larger than the sum of its proper divisors (612844901745).

999768013455 is a wasteful number, since it uses less digits than its factorization.

999768013455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000431.

The product of its (nonzero) digits is 73483200, while the sum is 66.

The spelling of 999768013455 in words is "nine hundred ninety-nine billion, seven hundred sixty-eight million, thirteen thousand, four hundred fifty-five".