999966555441111 has 8 divisors (see below), whose sum is σ = 1333351040974704. Its totient is φ = 666613220100800.

The previous prime is 999966555441103. The next prime is 999966555441143. The reversal of 999966555441111 is 111144555669999.

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 999966555441111 - 2³ = 999966555441103 is a prime.

It is a super-2 number, since 2×999966555441111² (a number of 31 digits) contains 22 as substring.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999966555441101) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7787473416 + ... + 7787601821.

It is an arithmetic number, because the mean of its divisors is an integer number (166668880121838).

Almost surely, 2^{999966555441111} is an apocalyptic number.

999966555441111 is a deficient number, since it is larger than the sum of its proper divisors (333384485533593).

999966555441111 is a wasteful number, since it uses less digits than its factorization.

999966555441111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15575096641.

The product of its digits is 472392000, while the sum is 75.

The spelling of 999966555441111 in words is "nine hundred ninety-nine trillion, nine hundred sixty-six billion, five hundred fifty-five million, four hundred forty-one thousand, one hundred eleven".