66687823740 has 48 divisors (see below), whose sum is σ = 196553589120. Its totient is φ = 16847449920.

The previous prime is 66687823687. The next prime is 66687823747. The reversal of 66687823740 is 4732878666.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66687823747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29247906 + ... + 29250185.

It is an arithmetic number, because the mean of its divisors is an integer number (4094866440).

Almost surely, 2^66687823740 is an apocalyptic number.

66687823740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66687823740 is an abundant number, since it is smaller than the sum of its proper divisors (129865765380).

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

66687823740 is a wasteful number, since it uses less digits than its factorization.

66687823740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58498122 (or 58498120 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 57.

The spelling of 66687823740 in words is "sixty-six billion, six hundred eighty-seven million, eight hundred twenty-three thousand, seven hundred forty".