66437783735720 has 64 divisors (see below), whose sum is σ = 153058780923840. Its totient is φ = 25940563891200.

The previous prime is 66437783735689. The next prime is 66437783735749. The reversal of 66437783735720 is 2753738773466.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9591521 + ... + 14995760.

It is an arithmetic number, because the mean of its divisors is an integer number (2391543451935).

Almost surely, 2^{66437783735720} is an apocalyptic number.

It is an amenable number.

66437783735720 is an abundant number, since it is smaller than the sum of its proper divisors (86620997188120).

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

66437783735720 is a wasteful number, since it uses less digits than its factorization.

66437783735720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24588906 (or 24588902 counting only the distinct ones).

The product of its (nonzero) digits is 746807040, while the sum is 68.

The spelling of 66437783735720 in words is "sixty-six trillion, four hundred thirty-seven billion, seven hundred eighty-three million, seven hundred thirty-five thousand, seven hundred twenty".