64061866840 has 32 divisors (see below), whose sum is σ = 144187500960. Its totient is φ = 25616160000.

The previous prime is 64061866793. The next prime is 64061866927. The reversal of 64061866840 is 4866816046.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146796 + ... + 386875.

It is an arithmetic number, because the mean of its divisors is an integer number (4505859405).

Almost surely, 2^64061866840 is an apocalyptic number.

It is an amenable number.

64061866840 is an abundant number, since it is smaller than the sum of its proper divisors (80125634120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64061866840 is a wasteful number, since it uses less digits than its factorization.

64061866840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536683 (or 536679 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 49.

The spelling of 64061866840 in words is "sixty-four billion, sixty-one million, eight hundred sixty-six thousand, eight hundred forty".