1681761979542 has 32 divisors (see below), whose sum is σ = 3495998177280. Its totient is φ = 538691519520.

The previous prime is 1681761979531. The next prime is 1681761979553. The reversal of 1681761979542 is 2459791671861.

It is an interprime number because it is at equal distance from previous prime (1681761979531) and next prime (1681761979553).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 22866838 + ... + 22940265.

It is an arithmetic number, because the mean of its divisors is an integer number (109249943040).

Almost surely, 2^{1681761979542} is an apocalyptic number.

1681761979542 is an abundant number, since it is smaller than the sum of its proper divisors (1814236197738).

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

1681761979542 is a wasteful number, since it uses less digits than its factorization.

1681761979542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45807348.

The product of its digits is 45722880, while the sum is 66.

The spelling of 1681761979542 in words is "one trillion, six hundred eighty-one billion, seven hundred sixty-one million, nine hundred seventy-nine thousand, five hundred forty-two".