66807478480 has 20 divisors (see below), whose sum is σ = 155327387652. Its totient is φ = 26722991360.

The previous prime is 66807478477. The next prime is 66807478589. The reversal of 66807478480 is 8487470866.

It can be written as a sum of positive squares in 2 ways, for example, as 38332940944 + 28474537536 = 195788^2 + 168744^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×66807478480² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 417546661 + ... + 417546820.

Almost surely, 2^66807478480 is an apocalyptic number.

It is an amenable number.

66807478480 is an abundant number, since it is smaller than the sum of its proper divisors (88519909172).

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

66807478480 is a wasteful number, since it uses less digits than its factorization.

66807478480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835093494 (or 835093488 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 58.

The spelling of 66807478480 in words is "sixty-six billion, eight hundred seven million, four hundred seventy-eight thousand, four hundred eighty".