66620742136 has 16 divisors (see below), whose sum is σ = 134522652600. Its totient is φ = 30748034784.

The previous prime is 66620742119. The next prime is 66620742157. The reversal of 66620742136 is 63124702666.

It is a junction number, because it is equal to n+sod(n) for n = 66620742092 and 66620742101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320291926 + ... + 320292133.

Almost surely, 2^66620742136 is an apocalyptic number.

It is an amenable number.

66620742136 is an abundant number, since it is smaller than the sum of its proper divisors (67901910464).

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

66620742136 is a wasteful number, since it uses less digits than its factorization.

66620742136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640584078 (or 640584074 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 66620742136 in words is "sixty-six billion, six hundred twenty million, seven hundred forty-two thousand, one hundred thirty-six".