167525566561 has 4 divisors (see below), whose sum is σ = 167526702000. Its totient is φ = 167524431124.

The previous prime is 167525566531. The next prime is 167525566583. The reversal of 167525566561 is 165665525761.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 165665525761 = 53 ⋅3125764637.

It is a cyclic number.

It is not a de Polignac number, because 167525566561 - 2¹⁷ = 167525435489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (167525566531) 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, 306271 + ... + 654868.

It is an arithmetic number, because the mean of its divisors is an integer number (41881675500).

Almost surely, 2^167525566561 is an apocalyptic number.

It is an amenable number.

167525566561 is a deficient number, since it is larger than the sum of its proper divisors (1135439).

167525566561 is an equidigital number, since it uses as much as digits as its factorization.

167525566561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135438.

The product of its digits is 11340000, while the sum is 55.

The spelling of 167525566561 in words is "one hundred sixty-seven billion, five hundred twenty-five million, five hundred sixty-six thousand, five hundred sixty-one".