66990006699 has 48 divisors (see below), whose sum is σ = 116072866560. Its totient is φ = 33599966400.

The previous prime is 66990006697. The next prime is 66990006709. The reversal of 66990006699 is 99660009966.

It is not a de Polignac number, because 66990006699 - 2¹ = 66990006697 is a prime.

66990006699 is a strobogrammatic number because it is the same when read upside-down.

It is a zygodrome in base 10.

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

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 380857 + ... + 528234.

It is an arithmetic number, because the mean of its divisors is an integer number (2418184720).

Almost surely, 2^66990006699 is an apocalyptic number.

66990006699 is a deficient number, since it is larger than the sum of its proper divisors (49082859861).

66990006699 is a wasteful number, since it uses less digits than its factorization.

66990006699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909152 (or 909141 counting only the distinct ones).

The product of its (nonzero) digits is 8503056, while the sum is 60.

The spelling of 66990006699 in words is "sixty-six billion, nine hundred ninety million, six thousand, six hundred ninety-nine".