64642624646 has 4 divisors (see below), whose sum is σ = 96963936972. Its totient is φ = 32321312322.

The previous prime is 64642624633. The next prime is 64642624663.

64642624646 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×64642624646² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64642624594 and 64642624603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16160656160 + ... + 16160656163.

It is an arithmetic number, because the mean of its divisors is an integer number (24240984243).

Almost surely, 2^64642624646 is an apocalyptic number.

64642624646 is a deficient number, since it is larger than the sum of its proper divisors (32321312326).

64642624646 is a wasteful number, since it uses less digits than its factorization.

64642624646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32321312325.

The product of its digits is 7962624, while the sum is 50.

The spelling of 64642624646 in words is "sixty-four billion, six hundred forty-two million, six hundred twenty-four thousand, six hundred forty-six".