139248637668 has 54 divisors (see below), whose sum is σ = 409457308806. Its totient is φ = 39785324544.

The previous prime is 139248637667. The next prime is 139248637679. The reversal of 139248637668 is 866736842931.

139248637668 is a `hidden beast` number, since 1 + 3 + 92 + 486 + 3 + 7 + 6 + 68 = 666.

It can be written as a sum of positive squares in only one way, i.e., 137568293604 + 1680344064 = 370902^2 + 40992^2 .

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (139248637667) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 39467805 + ... + 39471332.

Almost surely, 2^139248637668 is an apocalyptic number.

139248637668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

139248637668 is an abundant number, since it is smaller than the sum of its proper divisors (270208671138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139248637668 is a wasteful number, since it uses less digits than its factorization.

139248637668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78939161 (or 78939149 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The spelling of 139248637668 in words is "one hundred thirty-nine billion, two hundred forty-eight million, six hundred thirty-seven thousand, six hundred sixty-eight".