84604775161 has 3 divisors (see below), whose sum is σ = 84605066031. Its totient is φ = 84604484292.

The previous prime is 84604775137. The next prime is 84604775183. The reversal of 84604775161 is 16157740648.

It is a happy number.

The square root of 84604775161 is 290869.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 81721085161 + 2883690000 = 285869^2 + 53700^2 .

It is a de Polignac number, because none of the positive numbers 2^k-84604775161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84604775261) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 145435 + ... + 436303.

It is an arithmetic number, because the mean of its divisors is an integer number (28201688677).

Almost surely, 2^84604775161 is an apocalyptic number.

84604775161 is the 290869-th square number.

84604775161 is the 145435-th centered octagonal number.

It is an amenable number.

84604775161 is a deficient number, since it is larger than the sum of its proper divisors (290870).

84604775161 is an frugal number, since it uses more digits than its factorization.

84604775161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581738 (or 290869 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 49.

Multiplying 84604775161 by its sum of digits (49), we get a square (4145633982889 = 2036083²).

The spelling of 84604775161 in words is "eighty-four billion, six hundred four million, seven hundred seventy-five thousand, one hundred sixty-one".