139666466 has 4 divisors (see below), whose sum is σ = 209499702. Its totient is φ = 69833232.

The previous prime is 139666463. The next prime is 139666487. The reversal of 139666466 is 664666931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 664666931 = 103 ⋅6453077.

It can be written as a sum of positive squares in only one way, i.e., 134073241 + 5593225 = 11579^2 + 2365^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 139666466.

It is not an unprimeable number, because it can be changed into a prime (139666463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34916615 + ... + 34916618.

Almost surely, 2^139666466 is an apocalyptic number.

139666466 is a deficient number, since it is larger than the sum of its proper divisors (69833236).

139666466 is an equidigital number, since it uses as much as digits as its factorization.

139666466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69833235.

The product of its digits is 839808, while the sum is 47.

The square root of 139666466 is about 11818.0567776602. The cubic root of 139666466 is about 518.8367314991.

The spelling of 139666466 in words is "one hundred thirty-nine million, six hundred sixty-six thousand, four hundred sixty-six".