262401665161 has 4 divisors (see below), whose sum is σ = 262501326612. Its totient is φ = 262302003712.

The previous prime is 262401665153. The next prime is 262401665167. The reversal of 262401665161 is 161566104262.

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 120079575625 + 142322089536 = 346525^2 + 377256^2 .

It is a cyclic number.

It is not a de Polignac number, because 262401665161 - 2³ = 262401665153 is a prime.

It is a super-2 number, since 2×262401665161² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (262401665167) 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, 49826776 + ... + 49832041.

It is an arithmetic number, because the mean of its divisors is an integer number (65625331653).

Almost surely, 2^262401665161 is an apocalyptic number.

It is an amenable number.

262401665161 is a deficient number, since it is larger than the sum of its proper divisors (99661451).

262401665161 is an equidigital number, since it uses as much as digits as its factorization.

262401665161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99661450.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 262401665161 in words is "two hundred sixty-two billion, four hundred one million, six hundred sixty-five thousand, one hundred sixty-one".