66629587138488 has 48 divisors (see below), whose sum is σ = 196860143820600. Its totient is φ = 20190783981120.

The previous prime is 66629587138487. The next prime is 66629587138531. The reversal of 66629587138488 is 88483178592666.

It is a super-2 number, since 2×66629587138488² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66629587138481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42064132503 + ... + 42064134086.

Almost surely, 2^{66629587138488} is an apocalyptic number.

It is an amenable number.

66629587138488 is an abundant number, since it is smaller than the sum of its proper divisors (130230556682112).

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

66629587138488 is a wasteful number, since it uses less digits than its factorization.

66629587138488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84128266612 (or 84128266605 counting only the distinct ones).

The product of its digits is 6688604160, while the sum is 81.

The spelling of 66629587138488 in words is "sixty-six trillion, six hundred twenty-nine billion, five hundred eighty-seven million, one hundred thirty-eight thousand, four hundred eighty-eight".