155694561 has 16 divisors (see below), whose sum is σ = 227448000. Its totient is φ = 93950720.

The previous prime is 155694559. The next prime is 155694563. The reversal of 155694561 is 165496551.

It is an interprime number because it is at equal distance from previous prime (155694559) and next prime (155694563).

It is a cyclic number.

It is not a de Polignac number, because 155694561 - 2¹ = 155694559 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155694563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2436 + ... + 17813.

It is an arithmetic number, because the mean of its divisors is an integer number (14215500).

Almost surely, 2^155694561 is an apocalyptic number.

155694561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155694561 is a deficient number, since it is larger than the sum of its proper divisors (71753439).

155694561 is a wasteful number, since it uses less digits than its factorization.

155694561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20496.

The product of its digits is 162000, while the sum is 42.

The square root of 155694561 is about 12477.7626600284. The cubic root of 155694561 is about 537.9696976709.

The spelling of 155694561 in words is "one hundred fifty-five million, six hundred ninety-four thousand, five hundred sixty-one".