1911950445138 has 16 divisors (see below), whose sum is σ = 3824610003936. Its totient is φ = 637198629440.

The previous prime is 1911950445133. The next prime is 1911950445211. The reversal of 1911950445138 is 8315440591191.

It is not an unprimeable number, because it can be changed into a prime (1911950445133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29511348 + ... + 29576063.

It is an arithmetic number, because the mean of its divisors is an integer number (239038125246).

Almost surely, 2^{1911950445138} is an apocalyptic number.

1911950445138 is an abundant number, since it is smaller than the sum of its proper divisors (1912659558798).

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

1911950445138 is a wasteful number, since it uses less digits than its factorization.

1911950445138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59092809.

The product of its (nonzero) digits is 777600, while the sum is 51.

The spelling of 1911950445138 in words is "one trillion, nine hundred eleven billion, nine hundred fifty million, four hundred forty-five thousand, one hundred thirty-eight".