64621612646 has 4 divisors (see below), whose sum is σ = 96932418972. Its totient is φ = 32310806322.

The previous prime is 64621612631. The next prime is 64621612669.

64621612646 is nontrivially palindromic in base 10.

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

It is a super-3 number, since 3×64621612646³ (a number of 33 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64621612597 and 64621612606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16155403160 + ... + 16155403163.

It is an arithmetic number, because the mean of its divisors is an integer number (24233104743).

Almost surely, 2^64621612646 is an apocalyptic number.

64621612646 is a deficient number, since it is larger than the sum of its proper divisors (32310806326).

64621612646 is a wasteful number, since it uses less digits than its factorization.

64621612646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32310806325.

The product of its digits is 497664, while the sum is 44.

The spelling of 64621612646 in words is "sixty-four billion, six hundred twenty-one million, six hundred twelve thousand, six hundred forty-six".