155820213603 has 12 divisors (see below), whose sum is σ = 225086371120. Its totient is φ = 103874267376.

The previous prime is 155820213599. The next prime is 155820213607. The reversal of 155820213603 is 306312028551.

155820213603 is a `hidden beast` number, since 1 + 5 + 5 + 8 + 20 + 21 + 3 + 603 = 666.

155820213603 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (155820213599) and next prime (155820213607).

It is not a de Polignac number, because 155820213603 - 2² = 155820213599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155820213607) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 318463 + ... + 642696.

Almost surely, 2^155820213603 is an apocalyptic number.

155820213603 is a deficient number, since it is larger than the sum of its proper divisors (69266157517).

155820213603 is a wasteful number, since it uses less digits than its factorization.

155820213603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979178 (or 979175 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 155820213603 in words is "one hundred fifty-five billion, eight hundred twenty million, two hundred thirteen thousand, six hundred three".