1881608139644 has 12 divisors (see below), whose sum is σ = 3311847853944. Its totient is φ = 935365895664.

The previous prime is 1881608139643. The next prime is 1881608139709. The reversal of 1881608139644 is 4469318061881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881608139643) 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, 1359542762 + ... + 1359544145.

It is an arithmetic number, because the mean of its divisors is an integer number (275987321162).

Almost surely, 2^{1881608139644} is an apocalyptic number.

It is an amenable number.

1881608139644 is a deficient number, since it is larger than the sum of its proper divisors (1430239714300).

1881608139644 is a wasteful number, since it uses less digits than its factorization.

1881608139644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2719087084 (or 2719087082 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 59.

The spelling of 1881608139644 in words is "one trillion, eight hundred eighty-one billion, six hundred eight million, one hundred thirty-nine thousand, six hundred forty-four".