139781446644 has 96 divisors (see below), whose sum is σ = 384887365632. Its totient is φ = 38637936000.

The previous prime is 139781446639. The next prime is 139781446661. The reversal of 139781446644 is 446644187931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13069339 + ... + 13080029.

It is an arithmetic number, because the mean of its divisors is an integer number (4009243392).

Almost surely, 2^139781446644 is an apocalyptic number.

139781446644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139781446644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192443682816).

139781446644 is an abundant number, since it is smaller than the sum of its proper divisors (245105918988).

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

139781446644 is a wasteful number, since it uses less digits than its factorization.

139781446644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15757 (or 15755 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 57.

The spelling of 139781446644 in words is "one hundred thirty-nine billion, seven hundred eighty-one million, four hundred forty-six thousand, six hundred forty-four".