64148502778 has 8 divisors (see below), whose sum is σ = 98460492768. Its totient is φ = 31328338524.

The previous prime is 64148502731. The next prime is 64148502779. The reversal of 64148502778 is 87720584146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (64148502779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372956326 + ... + 372956497.

It is an arithmetic number, because the mean of its divisors is an integer number (12307561596).

Almost surely, 2^64148502778 is an apocalyptic number.

64148502778 is a deficient number, since it is larger than the sum of its proper divisors (34311989990).

64148502778 is a wasteful number, since it uses less digits than its factorization.

64148502778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745912868.

The product of its (nonzero) digits is 3010560, while the sum is 52.

The spelling of 64148502778 in words is "sixty-four billion, one hundred forty-eight million, five hundred two thousand, seven hundred seventy-eight".