155556302632561 has 4 divisors (see below), whose sum is σ = 155723747523300. Its totient is φ = 155388857741824.

The previous prime is 155556302632537. The next prime is 155556302632571. The reversal of 155556302632561 is 165236203655551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27394431492961 + 128161871139600 = 5233969^2 + 11320860^2 .

It is a cyclic number.

It is not a de Polignac number, because 155556302632561 - 2¹³ = 155556302624369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155556302632571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83722443976 + ... + 83722445833.

It is an arithmetic number, because the mean of its divisors is an integer number (38930936880825).

Almost surely, 2^{155556302632561} is an apocalyptic number.

It is an amenable number.

155556302632561 is a deficient number, since it is larger than the sum of its proper divisors (167444890739).

155556302632561 is an equidigital number, since it uses as much as digits as its factorization.

155556302632561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167444890738.

The product of its (nonzero) digits is 24300000, while the sum is 55.

The spelling of 155556302632561 in words is "one hundred fifty-five trillion, five hundred fifty-six billion, three hundred two million, six hundred thirty-two thousand, five hundred sixty-one".