85981245877 has 2 divisors, whose sum is σ = 85981245878. Its totient is φ = 85981245876.

The previous prime is 85981245841. The next prime is 85981245923. The reversal of 85981245877 is 77854218958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83980562436 + 2000683441 = 289794^2 + 44729^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85981245877 is a prime.

It is a super-2 number, since 2×85981245877² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85981245817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42990622938 + 42990622939.

It is an arithmetic number, because the mean of its divisors is an integer number (42990622939).

Almost surely, 2^85981245877 is an apocalyptic number.

It is an amenable number.

85981245877 is a deficient number, since it is larger than the sum of its proper divisors (1).

85981245877 is an equidigital number, since it uses as much as digits as its factorization.

85981245877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45158400, while the sum is 64.

The spelling of 85981245877 in words is "eighty-five billion, nine hundred eighty-one million, two hundred forty-five thousand, eight hundred seventy-seven".