84725672561 has 4 divisors (see below), whose sum is σ = 85677646500. Its totient is φ = 83773698624.

The previous prime is 84725672557. The next prime is 84725672567. The reversal of 84725672561 is 16527652748.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47585059600 + 37140612961 = 218140^2 + 192719^2 .

It is a cyclic number.

It is not a de Polignac number, because 84725672561 - 2² = 84725672557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84725672567) 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, 475986836 + ... + 475987013.

It is an arithmetic number, because the mean of its divisors is an integer number (21419411625).

Almost surely, 2^84725672561 is an apocalyptic number.

It is an amenable number.

84725672561 is a deficient number, since it is larger than the sum of its proper divisors (951973939).

84725672561 is an equidigital number, since it uses as much as digits as its factorization.

84725672561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951973938.

The product of its digits is 5644800, while the sum is 53.

The spelling of 84725672561 in words is "eighty-four billion, seven hundred twenty-five million, six hundred seventy-two thousand, five hundred sixty-one".