64815171628 has 18 divisors (see below), whose sum is σ = 117203507988. Its totient is φ = 31362177960.

The previous prime is 64815171623. The next prime is 64815171653. The reversal of 64815171628 is 82617151846.

It is not an unprimeable number, because it can be changed into a prime (64815171623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8426850 + ... + 8434537.

Almost surely, 2^64815171628 is an apocalyptic number.

It is an amenable number.

64815171628 is a deficient number, since it is larger than the sum of its proper divisors (52388336360).

64815171628 is a wasteful number, since it uses less digits than its factorization.

64815171628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16861453 (or 16861420 counting only the distinct ones).

The product of its digits is 645120, while the sum is 49.

The spelling of 64815171628 in words is "sixty-four billion, eight hundred fifteen million, one hundred seventy-one thousand, six hundred twenty-eight".