155551603405 has 16 divisors (see below), whose sum is σ = 214348622400. Its totient is φ = 107174309760.

The previous prime is 155551603387. The next prime is 155551603433. The reversal of 155551603405 is 504306155551.

It is a happy number.

155551603405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155551603405 - 2⁹ = 155551602893 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74425560 + ... + 74427649.

It is an arithmetic number, because the mean of its divisors is an integer number (13396788900).

Almost surely, 2^155551603405 is an apocalyptic number.

It is an amenable number.

155551603405 is a deficient number, since it is larger than the sum of its proper divisors (58797018995).

155551603405 is a wasteful number, since it uses less digits than its factorization.

155551603405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148853244.

The product of its (nonzero) digits is 225000, while the sum is 40.

Adding to 155551603405 its reverse (504306155551), we get a palindrome (659857758956).

The spelling of 155551603405 in words is "one hundred fifty-five billion, five hundred fifty-one million, six hundred three thousand, four hundred five".