66432701538 has 48 divisors (see below), whose sum is σ = 164541836160. Its totient is φ = 18975947328.

The previous prime is 66432701537. The next prime is 66432701539. The reversal of 66432701538 is 83510723466.

66432701538 is a `hidden beast` number, since 6 + 6 + 43 + 2 + 70 + 1 + 538 = 666.

It is an interprime number because it is at equal distance from previous prime (66432701537) and next prime (66432701539).

It is a junction number, because it is equal to n+sod(n) for n = 66432701493 and 66432701502.

It is not an unprimeable number, because it can be changed into a prime (66432701537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 446203 + ... + 576161.

It is an arithmetic number, because the mean of its divisors is an integer number (3427954920).

Almost surely, 2^66432701538 is an apocalyptic number.

66432701538 is an abundant number, since it is smaller than the sum of its proper divisors (98109134622).

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

66432701538 is a wasteful number, since it uses less digits than its factorization.

66432701538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134031 (or 134028 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 66432701538 in words is "sixty-six billion, four hundred thirty-two million, seven hundred one thousand, five hundred thirty-eight".