64990161318 has 16 divisors (see below), whose sum is σ = 130138652016. Its totient is φ = 21636998880.

The previous prime is 64990161287. The next prime is 64990161319. The reversal of 64990161318 is 81316109946.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64990161319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6591721 + ... + 6601572.

It is an arithmetic number, because the mean of its divisors is an integer number (8133665751).

Almost surely, 2^64990161318 is an apocalyptic number.

64990161318 is an abundant number, since it is smaller than the sum of its proper divisors (65148490698).

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

64990161318 is a wasteful number, since it uses less digits than its factorization.

64990161318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13194119.

The product of its (nonzero) digits is 279936, while the sum is 48.

The spelling of 64990161318 in words is "sixty-four billion, nine hundred ninety million, one hundred sixty-one thousand, three hundred eighteen".