85477804121 has 8 divisors (see below), whose sum is σ = 87169183560. Its totient is φ = 83789335552.

The previous prime is 85477804099. The next prime is 85477804157. The reversal of 85477804121 is 12140877458.

It can be written as a sum of positive squares in 4 ways, for example, as 3102490000 + 82375314121 = 55700^2 + 287011^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85477804121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85477804421) 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, 668360 + ... + 785913.

It is an arithmetic number, because the mean of its divisors is an integer number (10896147945).

Almost surely, 2^85477804121 is an apocalyptic number.

It is an amenable number.

85477804121 is a deficient number, since it is larger than the sum of its proper divisors (1691379439).

85477804121 is a wasteful number, since it uses less digits than its factorization.

85477804121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455435.

The product of its (nonzero) digits is 501760, while the sum is 47.

The spelling of 85477804121 in words is "eighty-five billion, four hundred seventy-seven million, eight hundred four thousand, one hundred twenty-one".