66477557696 has 28 divisors (see below), whose sum is σ = 143908805400. Its totient is φ = 30217071360.

The previous prime is 66477557693. The next prime is 66477557717. The reversal of 66477557696 is 69675577466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66477557693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47213471 + ... + 47214878.

Almost surely, 2^66477557696 is an apocalyptic number.

It is an amenable number.

66477557696 is an abundant number, since it is smaller than the sum of its proper divisors (77431247704).

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

66477557696 is a wasteful number, since it uses less digits than its factorization.

66477557696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94428372 (or 94428362 counting only the distinct ones).

The product of its digits is 400075200, while the sum is 68.

The spelling of 66477557696 in words is "sixty-six billion, four hundred seventy-seven million, five hundred fifty-seven thousand, six hundred ninety-six".