85851815122901 has 4 divisors (see below), whose sum is σ = 85851856004172. Its totient is φ = 85851774241632.

The previous prime is 85851815122883. The next prime is 85851815122933. The reversal of 85851815122901 is 10922151815858.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32833014600100 + 53018800522801 = 5730010^2 + 7281401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85851815122901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85851815122951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17109656 + ... + 21550961.

It is an arithmetic number, because the mean of its divisors is an integer number (21462964001043).

Almost surely, 2^{85851815122901} is an apocalyptic number.

It is an amenable number.

85851815122901 is a deficient number, since it is larger than the sum of its proper divisors (40881271).

85851815122901 is a wasteful number, since it uses less digits than its factorization.

85851815122901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40881270.

The product of its (nonzero) digits is 2304000, while the sum is 56.

The spelling of 85851815122901 in words is "eighty-five trillion, eight hundred fifty-one billion, eight hundred fifteen million, one hundred twenty-two thousand, nine hundred one".