85621461797 has 2 divisors, whose sum is σ = 85621461798. Its totient is φ = 85621461796.

The previous prime is 85621461769. The next prime is 85621461811. The reversal of 85621461797 is 79716412658.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70187375041 + 15434086756 = 264929^2 + 124234^2 .

It is a cyclic number.

It is not a de Polignac number, because 85621461797 - 2⁶ = 85621461733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85621461397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42810730898 + 42810730899.

It is an arithmetic number, because the mean of its divisors is an integer number (42810730899).

Almost surely, 2^85621461797 is an apocalyptic number.

It is an amenable number.

85621461797 is a deficient number, since it is larger than the sum of its proper divisors (1).

85621461797 is an equidigital number, since it uses as much as digits as its factorization.

85621461797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 56.

The spelling of 85621461797 in words is "eighty-five billion, six hundred twenty-one million, four hundred sixty-one thousand, seven hundred ninety-seven".