999997555311646 has 8 divisors (see below), whose sum is σ = 1500010154449920. Its totient is φ = 499994170495008.

The previous prime is 999997555311611. The next prime is 999997555311647. The reversal of 999997555311646 is 646113555799999.

999997555311646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×999997555311646² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999997555311647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2303309086 + ... + 2303743201.

It is an arithmetic number, because the mean of its divisors is an integer number (187501269306240).

Almost surely, 2^{999997555311646} is an apocalyptic number.

999997555311646 is a deficient number, since it is larger than the sum of its proper divisors (500012599138274).

999997555311646 is a wasteful number, since it uses less digits than its factorization.

999997555311646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4607160818.

The product of its digits is 22320522000, while the sum is 88.

The spelling of 999997555311646 in words is "nine hundred ninety-nine trillion, nine hundred ninety-seven billion, five hundred fifty-five million, three hundred eleven thousand, six hundred forty-six".