978111999999 has 48 divisors (see below), whose sum is σ = 1448388864000. Its totient is φ = 635771776128.

The previous prime is 978111999979. The next prime is 978112000013. The reversal of 978111999999 is 999999111879.

It is a happy number.

It is not a de Polignac number, because 978111999999 - 2⁸ = 978111999743 is a prime.

978111999999 is a modest number, since divided by 999999 gives 978111 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978111999929) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 181162702 + ... + 181168100.

It is an arithmetic number, because the mean of its divisors is an integer number (30174768000).

Almost surely, 2^978111999999 is an apocalyptic number.

978111999999 is a deficient number, since it is larger than the sum of its proper divisors (470276864001).

978111999999 is a wasteful number, since it uses less digits than its factorization.

978111999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7004 (or 7001 counting only the distinct ones).

The product of its digits is 267846264, while the sum is 81.

The spelling of 978111999999 in words is "nine hundred seventy-eight billion, one hundred eleven million, nine hundred ninety-nine thousand, nine hundred ninety-nine".