64664606740 has 24 divisors (see below), whose sum is σ = 135802192680. Its totient is φ = 25864601088.

The previous prime is 64664606729. The next prime is 64664606753. The reversal of 64664606740 is 4760646646.

It can be written as a sum of positive squares in 4 ways, for example, as 30063398544 + 34601208196 = 173388^2 + 186014^2 .

It is a super-2 number, since 2×64664606740² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

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, 430656 + ... + 561064.

It is an arithmetic number, because the mean of its divisors is an integer number (5658424695).

Almost surely, 2^64664606740 is an apocalyptic number.

It is an amenable number.

64664606740 is an abundant number, since it is smaller than the sum of its proper divisors (71137585940).

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

64664606740 is a wasteful number, since it uses less digits than its factorization.

64664606740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155211 (or 155209 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 49.

The spelling of 64664606740 in words is "sixty-four billion, six hundred sixty-four million, six hundred six thousand, seven hundred forty".