64721759948 has 24 divisors (see below), whose sum is σ = 116943590400. Its totient is φ = 31309785360.

The previous prime is 64721759941. The next prime is 64721759957. The reversal of 64721759948 is 84995712746.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is not an unprimeable number, because it can be changed into a prime (64721759941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503153 + ... + 618551.

It is an arithmetic number, because the mean of its divisors is an integer number (4872649600).

Almost surely, 2^64721759948 is an apocalyptic number.

It is an amenable number.

64721759948 is a deficient number, since it is larger than the sum of its proper divisors (52221830452).

64721759948 is a wasteful number, since it uses less digits than its factorization.

64721759948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119957 (or 119955 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 62.

The spelling of 64721759948 in words is "sixty-four billion, seven hundred twenty-one million, seven hundred fifty-nine thousand, nine hundred forty-eight".