138697066 has 16 divisors (see below), whose sum is σ = 211048200. Its totient is φ = 68352768.

The previous prime is 138697057. The next prime is 138697073. The reversal of 138697066 is 660796831.

It can be written as a sum of positive squares in 4 ways, for example, as 124970041 + 13727025 = 11179^2 + 3705^2 .

It is a super-2 number, since 2×138697066² = 38473752234016712, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65350 + ... + 67438.

Almost surely, 2^138697066 is an apocalyptic number.

138697066 is a deficient number, since it is larger than the sum of its proper divisors (72351134).

138697066 is a wasteful number, since it uses less digits than its factorization.

138697066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2553.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 138697066 is about 11776.9718518811. The cubic root of 138697066 is about 517.6335591546.

The spelling of 138697066 in words is "one hundred thirty-eight million, six hundred ninety-seven thousand, sixty-six".