85677874821 has 80 divisors (see below), whose sum is σ = 160228873728. Its totient is φ = 44507199600.

The previous prime is 85677874811. The next prime is 85677874823. The reversal of 85677874821 is 12847877658.

85677874821 is a `hidden beast` number, since 8 + 5 + 6 + 77 + 87 + 482 + 1 = 666.

It is not a de Polignac number, because 85677874821 - 2¹⁸ = 85677612677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85677874823) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1487326 + ... + 1543856.

Almost surely, 2^85677874821 is an apocalyptic number.

85677874821 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

85677874821 is a deficient number, since it is larger than the sum of its proper divisors (74550998907).

85677874821 is an frugal number, since it uses more digits than its factorization.

85677874821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56576 (or 56552 counting only the distinct ones).

The product of its digits is 42147840, while the sum is 63.

The spelling of 85677874821 in words is "eighty-five billion, six hundred seventy-seven million, eight hundred seventy-four thousand, eight hundred twenty-one".