657159091940 has 96 divisors (see below), whose sum is σ = 1522034236800. Its totient is φ = 236800843776.

The previous prime is 657159091921. The next prime is 657159091949. The reversal of 657159091940 is 49190951756.

It is not an unprimeable number, because it can be changed into a prime (657159091949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13581911 + ... + 13630209.

It is an arithmetic number, because the mean of its divisors is an integer number (15854523300).

Almost surely, 2^657159091940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 657159091940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (761017118400).

657159091940 is an abundant number, since it is smaller than the sum of its proper divisors (864875144860).

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

657159091940 is a wasteful number, since it uses less digits than its factorization.

657159091940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49581 (or 49579 counting only the distinct ones).

The product of its (nonzero) digits is 3061800, while the sum is 56.

The spelling of 657159091940 in words is "six hundred fifty-seven billion, one hundred fifty-nine million, ninety-one thousand, nine hundred forty".