162661261 has 32 divisors (see below), whose sum is σ = 204422400. Its totient is φ = 126282240.

The previous prime is 162661241. The next prime is 162661271. The reversal of 162661261 is 162166261.

It is not a de Polignac number, because 162661261 - 2⁷ = 162661133 is a prime.

It is a super-2 number, since 2×162661261² = 52917371660220242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162661201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 698001 + ... + 698233.

It is an arithmetic number, because the mean of its divisors is an integer number (6388200).

Almost surely, 2^162661261 is an apocalyptic number.

It is an amenable number.

162661261 is a deficient number, since it is larger than the sum of its proper divisors (41761139).

162661261 is a wasteful number, since it uses less digits than its factorization.

162661261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469.

The product of its digits is 5184, while the sum is 31.

The square root of 162661261 is about 12753.8723923364. The cubic root of 162661261 is about 545.8768937569.

The spelling of 162661261 in words is "one hundred sixty-two million, six hundred sixty-one thousand, two hundred sixty-one".