8537778857 has 4 divisors (see below), whose sum is σ = 8538047700. Its totient is φ = 8537510016.

The previous prime is 8537778853. The next prime is 8537778919. The reversal of 8537778857 is 7588777358.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7588777358 = 2 ⋅3794388679.

It can be written as a sum of positive squares in 2 ways, for example, as 2829069721 + 5708709136 = 53189^2 + 75556^2 .

It is a cyclic number.

It is not a de Polignac number, because 8537778857 - 2² = 8537778853 is a prime.

It is a super-2 number, since 2×8537778857² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8537778793 and 8537778802.

It is not an unprimeable number, because it can be changed into a prime (8537778853) 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, 79232 + ... + 152817.

It is an arithmetic number, because the mean of its divisors is an integer number (2134511925).

Almost surely, 2^8537778857 is an apocalyptic number.

It is an amenable number.

8537778857 is a deficient number, since it is larger than the sum of its proper divisors (268843).

8537778857 is a wasteful number, since it uses less digits than its factorization.

8537778857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268842.

The product of its digits is 92198400, while the sum is 65.

The square root of 8537778857 is about 92400.1020399869. The cubic root of 8537778857 is about 2043.8466171446.

The spelling of 8537778857 in words is "eight billion, five hundred thirty-seven million, seven hundred seventy-eight thousand, eight hundred fifty-seven".