1916662391638 has 8 divisors (see below), whose sum is σ = 2877234428088. Its totient is φ = 957584248944.

The previous prime is 1916662391551. The next prime is 1916662391659. The reversal of 1916662391638 is 8361932666191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 373470231 + ... + 373475362.

It is an arithmetic number, because the mean of its divisors is an integer number (359654303511).

Almost surely, 2^{1916662391638} is an apocalyptic number.

1916662391638 is a deficient number, since it is larger than the sum of its proper divisors (960572036450).

1916662391638 is a wasteful number, since it uses less digits than its factorization.

1916662391638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746946878.

The product of its digits is 15116544, while the sum is 61.

The spelling of 1916662391638 in words is "one trillion, nine hundred sixteen billion, six hundred sixty-two million, three hundred ninety-one thousand, six hundred thirty-eight".