66720683436 has 48 divisors (see below), whose sum is σ = 169883938560. Its totient is φ = 20212499520.

The previous prime is 66720683413. The next prime is 66720683459. The reversal of 66720683436 is 63438602766.

It is an interprime number because it is at equal distance from previous prime (66720683413) and next prime (66720683459).

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, 392385 + ... + 536103.

It is an arithmetic number, because the mean of its divisors is an integer number (3539248720).

Almost surely, 2^66720683436 is an apocalyptic number.

66720683436 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

66720683436 is an abundant number, since it is smaller than the sum of its proper divisors (103163255124).

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

66720683436 is a wasteful number, since it uses less digits than its factorization.

66720683436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147254 (or 147252 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 51.

The spelling of 66720683436 in words is "sixty-six billion, seven hundred twenty million, six hundred eighty-three thousand, four hundred thirty-six".