66990006698 has 16 divisors (see below), whose sum is σ = 103733028096. Its totient is φ = 32412467520.

The previous prime is 66990006697. The next prime is 66990006709. The reversal of 66990006698 is 89660009966.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66990006697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1513490 + ... + 1557122.

It is an arithmetic number, because the mean of its divisors is an integer number (6483314256).

Almost surely, 2^66990006698 is an apocalyptic number.

66990006698 is a deficient number, since it is larger than the sum of its proper divisors (36743021398).

66990006698 is a wasteful number, since it uses less digits than its factorization.

66990006698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68429.

The product of its (nonzero) digits is 7558272, while the sum is 59.

The spelling of 66990006698 in words is "sixty-six billion, nine hundred ninety million, six thousand, six hundred ninety-eight".