978945377091 has 16 divisors (see below), whose sum is σ = 1427209069440. Its totient is φ = 591930011520.

The previous prime is 978945377057. The next prime is 978945377143. The reversal of 978945377091 is 190773549879.

978945377091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 978945377091 - 2⁶ = 978945377027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (978945377041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34240921 + ... + 34269498.

It is an arithmetic number, because the mean of its divisors is an integer number (89200566840).

Almost surely, 2^978945377091 is an apocalyptic number.

978945377091 is a deficient number, since it is larger than the sum of its proper divisors (448263692349).

978945377091 is a wasteful number, since it uses less digits than its factorization.

978945377091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68510866.

The product of its (nonzero) digits is 120022560, while the sum is 69.

The spelling of 978945377091 in words is "nine hundred seventy-eight billion, nine hundred forty-five million, three hundred seventy-seven thousand, ninety-one".