123561655 has 32 divisors (see below), whose sum is σ = 180956160. Its totient is φ = 79107840.

The previous prime is 123561587. The next prime is 123561671. The reversal of 123561655 is 556165321.

It is not a de Polignac number, because 123561655 - 2⁹ = 123561143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123561655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45907 + ... + 48523.

It is an arithmetic number, because the mean of its divisors is an integer number (5654880).

Almost surely, 2^123561655 is an apocalyptic number.

123561655 is a deficient number, since it is larger than the sum of its proper divisors (57394505).

123561655 is a wasteful number, since it uses less digits than its factorization.

123561655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2719.

The product of its digits is 27000, while the sum is 34.

The square root of 123561655 is about 11115.8290289119. The cubic root of 123561655 is about 498.0748034169.

The spelling of 123561655 in words is "one hundred twenty-three million, five hundred sixty-one thousand, six hundred fifty-five".