85781316157 has 8 divisors (see below), whose sum is σ = 87018823800. Its totient is φ = 84549890304.

The previous prime is 85781316149. The next prime is 85781316191. The reversal of 85781316157 is 75161318758.

It can be written as a sum of positive squares in 4 ways, for example, as 482856676 + 85298459481 = 21974^2 + 292059^2 .

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 85781316157 - 2³ = 85781316149 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 (85781313157) 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, 1492032 + ... + 1548457.

It is an arithmetic number, because the mean of its divisors is an integer number (10877352975).

Almost surely, 2^85781316157 is an apocalyptic number.

It is an amenable number.

85781316157 is a deficient number, since it is larger than the sum of its proper divisors (1237507643).

85781316157 is a wasteful number, since it uses less digits than its factorization.

85781316157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3040895.

The product of its digits is 1411200, while the sum is 52.

The spelling of 85781316157 in words is "eighty-five billion, seven hundred eighty-one million, three hundred sixteen thousand, one hundred fifty-seven".