139660065869 has 4 divisors (see below), whose sum is σ = 140179248540. Its totient is φ = 139140883200.

The previous prime is 139660065841. The next prime is 139660065943. The reversal of 139660065869 is 968560066931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55019800969 + 84640264900 = 234563^2 + 290930^2 .

It is a cyclic number.

It is not a de Polignac number, because 139660065869 - 2³⁶ = 70940589133 is a prime.

It is a super-2 number, since 2×139660065869² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139660065469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259590932 + ... + 259591469.

It is an arithmetic number, because the mean of its divisors is an integer number (35044812135).

Almost surely, 2^139660065869 is an apocalyptic number.

It is an amenable number.

139660065869 is a deficient number, since it is larger than the sum of its proper divisors (519182671).

139660065869 is an equidigital number, since it uses as much as digits as its factorization.

139660065869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519182670.

The product of its (nonzero) digits is 12597120, while the sum is 59.

The spelling of 139660065869 in words is "one hundred thirty-nine billion, six hundred sixty million, sixty-five thousand, eight hundred sixty-nine".