85054167661 has 4 divisors (see below), whose sum is σ = 90057354012. Its totient is φ = 80050981312.

The previous prime is 85054167643. The next prime is 85054167677. The reversal of 85054167661 is 16676145058.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16676145058 = 2 ⋅8338072529.

It can be written as a sum of positive squares in 2 ways, for example, as 33853792036 + 51200375625 = 183994^2 + 226275^2 .

It is a cyclic number.

It is not a de Polignac number, because 85054167661 - 2¹¹ = 85054165613 is a prime.

It is a super-2 number, since 2×85054167661² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85054167061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2501593150 + ... + 2501593183.

It is an arithmetic number, because the mean of its divisors is an integer number (22514338503).

Almost surely, 2^85054167661 is an apocalyptic number.

It is an amenable number.

85054167661 is a deficient number, since it is larger than the sum of its proper divisors (5003186351).

85054167661 is a wasteful number, since it uses less digits than its factorization.

85054167661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5003186350.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 85054167661 in words is "eighty-five billion, fifty-four million, one hundred sixty-seven thousand, six hundred sixty-one".