66634736358 has 48 divisors (see below), whose sum is σ = 141697028880. Its totient is φ = 20886257664.

The previous prime is 66634736351. The next prime is 66634736359. The reversal of 66634736358 is 85363743666.

It is a junction number, because it is equal to n+sod(n) for n = 66634736298 and 66634736307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66634736351) 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, 1982638 + ... + 2015966.

It is an arithmetic number, because the mean of its divisors is an integer number (2952021435).

Almost surely, 2^66634736358 is an apocalyptic number.

66634736358 is an abundant number, since it is smaller than the sum of its proper divisors (75062292522).

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

66634736358 is a wasteful number, since it uses less digits than its factorization.

66634736358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34521 (or 34504 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 57.

It can be divided in two parts, 666347 and 36358, that added together give a triangular number (702705 = T₁₁₈₅).

The spelling of 66634736358 in words is "sixty-six billion, six hundred thirty-four million, seven hundred thirty-six thousand, three hundred fifty-eight".