155623302503 has 4 divisors (see below), whose sum is σ = 155677700088. Its totient is φ = 155568904920.

The previous prime is 155623302479. The next prime is 155623302509. The reversal of 155623302503 is 305203326551.

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

It is a cyclic number.

It is not a de Polignac number, because 155623302503 - 2¹⁰ = 155623301479 is a prime.

It is a super-2 number, since 2×155623302503² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155623302509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27194501 + ... + 27200222.

It is an arithmetic number, because the mean of its divisors is an integer number (38919425022).

Almost surely, 2^155623302503 is an apocalyptic number.

155623302503 is a deficient number, since it is larger than the sum of its proper divisors (54397585).

155623302503 is an equidigital number, since it uses as much as digits as its factorization.

155623302503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54397584.

The product of its (nonzero) digits is 81000, while the sum is 35.

The spelling of 155623302503 in words is "one hundred fifty-five billion, six hundred twenty-three million, three hundred two thousand, five hundred three".