64458381778 has 32 divisors (see below), whose sum is σ = 114747752448. Its totient is φ = 26573778000.

The previous prime is 64458381749. The next prime is 64458381791. The reversal of 64458381778 is 87718385446.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372198 + ... + 517153.

It is an arithmetic number, because the mean of its divisors is an integer number (3585867264).

Almost surely, 2^64458381778 is an apocalyptic number.

64458381778 is a deficient number, since it is larger than the sum of its proper divisors (50289370670).

64458381778 is a wasteful number, since it uses less digits than its factorization.

64458381778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889558.

The product of its digits is 36126720, while the sum is 61.

The spelling of 64458381778 in words is "sixty-four billion, four hundred fifty-eight million, three hundred eighty-one thousand, seven hundred seventy-eight".