66450080690 has 32 divisors (see below), whose sum is σ = 141106904064. Its totient is φ = 22047952320.

The previous prime is 66450080677. The next prime is 66450080693. The reversal of 66450080690 is 9608005466.

It is a super-2 number, since 2×66450080690² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66450080693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15308909 + ... + 15313248.

It is an arithmetic number, because the mean of its divisors is an integer number (4409590752).

Almost surely, 2^66450080690 is an apocalyptic number.

66450080690 is an abundant number, since it is smaller than the sum of its proper divisors (74656823374).

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

66450080690 is a wasteful number, since it uses less digits than its factorization.

66450080690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30622202.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 66450080690 in words is "sixty-six billion, four hundred fifty million, eighty thousand, six hundred ninety".