85604477961 has 4 divisors (see below), whose sum is σ = 114139303952. Its totient is φ = 57069651972.

The previous prime is 85604477957. The next prime is 85604478007. The reversal of 85604477961 is 16977440658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 85604477961 - 2² = 85604477957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85604477911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14267412991 + ... + 14267412996.

It is an arithmetic number, because the mean of its divisors is an integer number (28534825988).

Almost surely, 2^85604477961 is an apocalyptic number.

It is an amenable number.

85604477961 is a deficient number, since it is larger than the sum of its proper divisors (28534825991).

85604477961 is a wasteful number, since it uses less digits than its factorization.

85604477961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28534825990.

The product of its (nonzero) digits is 10160640, while the sum is 57.

The spelling of 85604477961 in words is "eighty-five billion, six hundred four million, four hundred seventy-seven thousand, nine hundred sixty-one".