785143968181 has 8 divisors (see below), whose sum is σ = 786619575000. Its totient is φ = 783669719040.

The previous prime is 785143968157. The next prime is 785143968229. The reversal of 785143968181 is 181869341587.

It can be written as a sum of positive squares in 4 ways, for example, as 18065779281 + 767078188900 = 134409^2 + 875830^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 785143968181 - 2⁹ = 785143967669 is a prime.

It is a super-2 number, since 2×785143968181² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (785143968101) 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, 821991 + ... + 1498651.

It is an arithmetic number, because the mean of its divisors is an integer number (98327446875).

Almost surely, 2^785143968181 is an apocalyptic number.

It is an amenable number.

785143968181 is a deficient number, since it is larger than the sum of its proper divisors (1475606819).

785143968181 is a wasteful number, since it uses less digits than its factorization.

785143968181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678839.

The product of its digits is 11612160, while the sum is 61.

The spelling of 785143968181 in words is "seven hundred eighty-five billion, one hundred forty-three million, nine hundred sixty-eight thousand, one hundred eighty-one".