155774561 has 8 divisors (see below), whose sum is σ = 162846720. Its totient is φ = 148727392.

The previous prime is 155774557. The next prime is 155774611. The reversal of 155774561 is 165477551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155774561 - 2² = 155774557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155774501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7136 + ... + 19038.

It is an arithmetic number, because the mean of its divisors is an integer number (20355840).

Almost surely, 2^155774561 is an apocalyptic number.

It is an amenable number.

155774561 is a deficient number, since it is larger than the sum of its proper divisors (7072159).

155774561 is a wasteful number, since it uses less digits than its factorization.

155774561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12495.

The product of its digits is 147000, while the sum is 41.

The square root of 155774561 is about 12480.9679512448. The cubic root of 155774561 is about 538.0618229329.

The spelling of 155774561 in words is "one hundred fifty-five million, seven hundred seventy-four thousand, five hundred sixty-one".