64948841978 has 4 divisors (see below), whose sum is σ = 97423262970. Its totient is φ = 32474420988.

The previous prime is 64948841953. The next prime is 64948841981. The reversal of 64948841978 is 87914884946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 41167192609 + 23781649369 = 202897^2 + 154213^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16237210493 + ... + 16237210496.

Almost surely, 2^64948841978 is an apocalyptic number.

64948841978 is a deficient number, since it is larger than the sum of its proper divisors (32474420992).

64948841978 is a wasteful number, since it uses less digits than its factorization.

64948841978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32474420991.

The product of its digits is 111476736, while the sum is 68.

The spelling of 64948841978 in words is "sixty-four billion, nine hundred forty-eight million, eight hundred forty-one thousand, nine hundred seventy-eight".