139801066 has 4 divisors (see below), whose sum is σ = 209701602. Its totient is φ = 69900532.

The previous prime is 139801033. The next prime is 139801087. The reversal of 139801066 is 660108931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 660108931 = 9623 ⋅68597.

It can be written as a sum of positive squares in only one way, i.e., 139736041 + 65025 = 11821^2 + 255^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34950265 + ... + 34950268.

Almost surely, 2^139801066 is an apocalyptic number.

139801066 is a deficient number, since it is larger than the sum of its proper divisors (69900536).

139801066 is an equidigital number, since it uses as much as digits as its factorization.

139801066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69900535.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 139801066 is about 11823.7500819326. The cubic root of 139801066 is about 519.0033498818.

Adding to 139801066 its reverse (660108931), we get a palindrome (799909997).

The spelling of 139801066 in words is "one hundred thirty-nine million, eight hundred one thousand, sixty-six".