1691236938402 has 64 divisors (see below), whose sum is σ = 4110296284800. Its totient is φ = 511205048640.

The previous prime is 1691236938397. The next prime is 1691236938421. The reversal of 1691236938402 is 2048396321961.

1691236938402 is a `hidden beast` number, since 169 + 12 + 3 + 69 + 3 + 8 + 402 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3350077 + ... + 3821712.

It is an arithmetic number, because the mean of its divisors is an integer number (64223379450).

Almost surely, 2^{1691236938402} is an apocalyptic number.

1691236938402 is an abundant number, since it is smaller than the sum of its proper divisors (2419059346398).

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

1691236938402 is a wasteful number, since it uses less digits than its factorization.

1691236938402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7172208 (or 7172202 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 1691236938402 in words is "one trillion, six hundred ninety-one billion, two hundred thirty-six million, nine hundred thirty-eight thousand, four hundred two".