66319363640 has 32 divisors (see below), whose sum is σ = 149247792000. Its totient is φ = 26522550144.

The previous prime is 66319363631. The next prime is 66319363657. The reversal of 66319363640 is 4636391366.

It is a super-2 number, since 2×66319363640² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47801 + ... + 367319.

It is an arithmetic number, because the mean of its divisors is an integer number (4663993500).

Almost surely, 2^66319363640 is an apocalyptic number.

It is an amenable number.

66319363640 is an abundant number, since it is smaller than the sum of its proper divisors (82928428360).

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

66319363640 is a wasteful number, since it uses less digits than its factorization.

66319363640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324719 (or 324715 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 47.

The spelling of 66319363640 in words is "sixty-six billion, three hundred nineteen million, three hundred sixty-three thousand, six hundred forty".