11978989002 has 12 divisors (see below), whose sum is σ = 25954476210. Its totient is φ = 3992996328.

The previous prime is 11978988913. The next prime is 11978989013. The reversal of 11978989002 is 20098987911.

It can be written as a sum of positive squares in only one way, i.e., 7342604721 + 4636384281 = 85689^2 + 68091^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 11978989002.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 332749677 + ... + 332749712.

Almost surely, 2^11978989002 is an apocalyptic number.

11978989002 is an abundant number, since it is smaller than the sum of its proper divisors (13975487208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11978989002 is a wasteful number, since it uses less digits than its factorization.

11978989002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665499397 (or 665499394 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The spelling of 11978989002 in words is "eleven billion, nine hundred seventy-eight million, nine hundred eighty-nine thousand, two".