1691672309938 has 16 divisors (see below), whose sum is σ = 2738312740800. Its totient is φ = 779168601936.

The previous prime is 1691672309911. The next prime is 1691672309969. The reversal of 1691672309938 is 8399032761961.

It is a self number, because there is not a number n which added to its sum of digits gives 1691672309938.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66788488 + ... + 66813811.

It is an arithmetic number, because the mean of its divisors is an integer number (171144546300).

Almost surely, 2^{1691672309938} is an apocalyptic number.

1691672309938 is a deficient number, since it is larger than the sum of its proper divisors (1046640430862).

1691672309938 is a wasteful number, since it uses less digits than its factorization.

1691672309938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133602801.

The product of its (nonzero) digits is 26453952, while the sum is 64.

The spelling of 1691672309938 in words is "one trillion, six hundred ninety-one billion, six hundred seventy-two million, three hundred nine thousand, nine hundred thirty-eight".