85691306549 has 2 divisors, whose sum is σ = 85691306550. Its totient is φ = 85691306548.

The previous prime is 85691306461. The next prime is 85691306579. The reversal of 85691306549 is 94560319658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72370684324 + 13320622225 = 269018^2 + 115415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85691306549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85691306494 and 85691306503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85691306579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42845653274 + 42845653275.

It is an arithmetic number, because the mean of its divisors is an integer number (42845653275).

Almost surely, 2^85691306549 is an apocalyptic number.

It is an amenable number.

85691306549 is a deficient number, since it is larger than the sum of its proper divisors (1).

85691306549 is an equidigital number, since it uses as much as digits as its factorization.

85691306549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6998400, while the sum is 56.

The spelling of 85691306549 in words is "eighty-five billion, six hundred ninety-one million, three hundred six thousand, five hundred forty-nine".