64645854646 has 4 divisors (see below), whose sum is σ = 96968781972. Its totient is φ = 32322927322.

The previous prime is 64645854643. The next prime is 64645854703.

64645854646 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64645854641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16161463660 + ... + 16161463663.

It is an arithmetic number, because the mean of its divisors is an integer number (24242195493).

Almost surely, 2^64645854646 is an apocalyptic number.

64645854646 is a deficient number, since it is larger than the sum of its proper divisors (32322927326).

64645854646 is a wasteful number, since it uses less digits than its factorization.

64645854646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32322927325.

The product of its digits is 66355200, while the sum is 58.

The spelling of 64645854646 in words is "sixty-four billion, six hundred forty-five million, eight hundred fifty-four thousand, six hundred forty-six".