139668663 has 16 divisors (see below), whose sum is σ = 188470656. Its totient is φ = 91996320.

The previous prime is 139668653. The next prime is 139668689. The reversal of 139668663 is 366866931.

139668663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 139668663 - 2¹³ = 139660471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139668643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108220 + ... + 109502.

It is an arithmetic number, because the mean of its divisors is an integer number (11779416).

Almost surely, 2^139668663 is an apocalyptic number.

139668663 is a deficient number, since it is larger than the sum of its proper divisors (48801993).

139668663 is a wasteful number, since it uses less digits than its factorization.

139668663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694.

The product of its digits is 839808, while the sum is 48.

The square root of 139668663 is about 11818.1497282781. The cubic root of 139668663 is about 518.8394519764.

The spelling of 139668663 in words is "one hundred thirty-nine million, six hundred sixty-eight thousand, six hundred sixty-three".