64778487746 has 12 divisors (see below), whose sum is σ = 113031851238. Its totient is φ = 27762208992.

The previous prime is 64778487727. The next prime is 64778487863.

64778487746 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 58908629521 + 5869858225 = 242711^2 + 76615^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 330502391 + ... + 330502586.

Almost surely, 2^64778487746 is an apocalyptic number.

64778487746 is a deficient number, since it is larger than the sum of its proper divisors (48253363492).

64778487746 is a wasteful number, since it uses less digits than its factorization.

64778487746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661004993 (or 661004986 counting only the distinct ones).

The product of its digits is 354041856, while the sum is 68.

The spelling of 64778487746 in words is "sixty-four billion, seven hundred seventy-eight million, four hundred eighty-seven thousand, seven hundred forty-six".