1681570091949 has 8 divisors (see below), whose sum is σ = 2445920133792. Its totient is φ = 1019133389040.

The previous prime is 1681570091863. The next prime is 1681570091963. The reversal of 1681570091949 is 9491900751861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1681570091949 - 2¹² = 1681570087853 is a prime.

It is a super-3 number, since 3×1681570091949³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1681570091892 and 1681570091901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681570091989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25478334694 + ... + 25478334759.

It is an arithmetic number, because the mean of its divisors is an integer number (305740016724).

Almost surely, 2^{1681570091949} is an apocalyptic number.

It is an amenable number.

1681570091949 is a deficient number, since it is larger than the sum of its proper divisors (764350041843).

1681570091949 is a wasteful number, since it uses less digits than its factorization.

1681570091949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50956669467.

The product of its (nonzero) digits is 4898880, while the sum is 60.

The spelling of 1681570091949 in words is "one trillion, six hundred eighty-one billion, five hundred seventy million, ninety-one thousand, nine hundred forty-nine".