10978945664 has 16 divisors (see below), whose sum is σ = 21872118570. Its totient is φ = 5489472768.

The previous prime is 10978945613. The next prime is 10978945669. The reversal of 10978945664 is 46654987901.

It can be written as a sum of positive squares in only one way, i.e., 6722688064 + 4256257600 = 81992^2 + 65240^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (10978945669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42886379 + ... + 42886634.

Almost surely, 2^10978945664 is an apocalyptic number.

It is an amenable number.

10978945664 is a deficient number, since it is larger than the sum of its proper divisors (10893172906).

10978945664 is an frugal number, since it uses more digits than its factorization.

10978945664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85773027 (or 85773015 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 59.

The spelling of 10978945664 in words is "ten billion, nine hundred seventy-eight million, nine hundred forty-five thousand, six hundred sixty-four".