66510480738 has 64 divisors (see below), whose sum is σ = 146681644032. Its totient is φ = 19975636800.

The previous prime is 66510480721. The next prime is 66510480767. The reversal of 66510480738 is 83708401566.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5853763 + ... + 5865113.

It is an arithmetic number, because the mean of its divisors is an integer number (2291900688).

Almost surely, 2^66510480738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66510480738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73340822016).

66510480738 is an abundant number, since it is smaller than the sum of its proper divisors (80171163294).

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

66510480738 is a wasteful number, since it uses less digits than its factorization.

66510480738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13159.

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 66510480738 in words is "sixty-six billion, five hundred ten million, four hundred eighty thousand, seven hundred thirty-eight".