139186016621 has 16 divisors (see below), whose sum is σ = 145683488304. Its totient is φ = 132833885184.

The previous prime is 139186016617. The next prime is 139186016633. The reversal of 139186016621 is 126610681931.

It can be written as a sum of positive squares in 8 ways, for example, as 56363508100 + 82822508521 = 237410^2 + 287789^2 .

It is a cyclic number.

It is not a de Polignac number, because 139186016621 - 2² = 139186016617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139186016521) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 10262981 + ... + 10276533.

It is an arithmetic number, because the mean of its divisors is an integer number (9105218019).

Almost surely, 2^139186016621 is an apocalyptic number.

It is an amenable number.

139186016621 is a deficient number, since it is larger than the sum of its proper divisors (6497471683).

139186016621 is a wasteful number, since it uses less digits than its factorization.

139186016621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18880.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 139186016621 in words is "one hundred thirty-nine billion, one hundred eighty-six million, sixteen thousand, six hundred twenty-one".