64443877641 has 64 divisors (see below), whose sum is σ = 112971264000. Its totient is φ = 35792850240.

The previous prime is 64443877639. The next prime is 64443877643. The reversal of 64443877641 is 14677834446.

64443877641 is a `hidden beast` number, since 64 + 443 + 87 + 7 + 64 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (64443877639) and next prime (64443877643).

It is not a de Polignac number, because 64443877641 - 2¹ = 64443877639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64443877643) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 476640 + ... + 596718.

It is an arithmetic number, because the mean of its divisors is an integer number (1765176000).

Almost surely, 2^64443877641 is an apocalyptic number.

It is an amenable number.

64443877641 is a deficient number, since it is larger than the sum of its proper divisors (48527386359).

64443877641 is a wasteful number, since it uses less digits than its factorization.

64443877641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120251 (or 120245 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 54.

The spelling of 64443877641 in words is "sixty-four billion, four hundred forty-three million, eight hundred seventy-seven thousand, six hundred forty-one".