1691693384820 has 48 divisors (see below), whose sum is σ = 4736807859840. Its totient is φ = 451111913856.

The previous prime is 1691693384807. The next prime is 1691693384861. The reversal of 1691693384820 is 284833961961.

It is a hoax number, since the sum of its digits (60) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5456946 + ... + 5758614.

It is an arithmetic number, because the mean of its divisors is an integer number (98683497080).

Almost surely, 2^{1691693384820} is an apocalyptic number.

1691693384820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1691693384820 is an abundant number, since it is smaller than the sum of its proper divisors (3045114475020).

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

1691693384820 is a wasteful number, since it uses less digits than its factorization.

1691693384820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395144 (or 395142 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 60.

The spelling of 1691693384820 in words is "one trillion, six hundred ninety-one billion, six hundred ninety-three million, three hundred eighty-four thousand, eight hundred twenty".