64449336956 has 24 divisors (see below), whose sum is σ = 119670203520. Its totient is φ = 30265766912.

The previous prime is 64449336923. The next prime is 64449336971. The reversal of 64449336956 is 65963394446.

It is a super-3 number, since 3×64449336956³ (a number of 33 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64449336895 and 64449336904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 956765 + ... + 1021908.

It is an arithmetic number, because the mean of its divisors is an integer number (4986258480).

Almost surely, 2^64449336956 is an apocalyptic number.

It is an amenable number.

64449336956 is a deficient number, since it is larger than the sum of its proper divisors (55220866564).

64449336956 is a wasteful number, since it uses less digits than its factorization.

64449336956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979173 (or 1979171 counting only the distinct ones).

The product of its digits is 50388480, while the sum is 59.

The spelling of 64449336956 in words is "sixty-four billion, four hundred forty-nine million, three hundred thirty-six thousand, nine hundred fifty-six".