155664081 has 12 divisors (see below), whose sum is σ = 225992052. Its totient is φ = 103248096.

The previous prime is 155664077. The next prime is 155664101. The reversal of 155664081 is 180466551.

155664081 is a `hidden beast` number, since 1 + 5 + 5 + 6 + 640 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 132710400 + 22953681 = 11520^2 + 4791^2 .

It is not a de Polignac number, because 155664081 - 2² = 155664077 is a prime.

It is a super-2 number, since 2×155664081² = 48462612227149122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155664001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42126 + ... + 45671.

It is an arithmetic number, because the mean of its divisors is an integer number (18832671).

Almost surely, 2^155664081 is an apocalyptic number.

It is an amenable number.

155664081 is a deficient number, since it is larger than the sum of its proper divisors (70327971).

155664081 is a wasteful number, since it uses less digits than its factorization.

155664081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88000 (or 87997 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 155664081 is about 12476.5412274396. The cubic root of 155664081 is about 537.9345896440.

The spelling of 155664081 in words is "one hundred fifty-five million, six hundred sixty-four thousand, eighty-one".