1691139938202 has 96 divisors (see below), whose sum is σ = 4464154094400. Its totient is φ = 473046117120.

The previous prime is 1691139938143. The next prime is 1691139938203. The reversal of 1691139938202 is 2028399311961.

1691139938202 is a `hidden beast` number, since 1 + 6 + 9 + 11 + 399 + 38 + 202 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1691139938203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12097327 + ... + 12236322.

It is an arithmetic number, because the mean of its divisors is an integer number (46501605150).

Almost surely, 2^{1691139938202} is an apocalyptic number.

1691139938202 is an abundant number, since it is smaller than the sum of its proper divisors (2773014156198).

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

1691139938202 is a wasteful number, since it uses less digits than its factorization.

1691139938202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24333690 (or 24333678 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The spelling of 1691139938202 in words is "one trillion, six hundred ninety-one billion, one hundred thirty-nine million, nine hundred thirty-eight thousand, two hundred two".