155355320503 has 4 divisors (see below), whose sum is σ = 155506005648. Its totient is φ = 155204635360.

The previous prime is 155355320489. The next prime is 155355320507. The reversal of 155355320503 is 305023553551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305023553551 = 1721 ⋅177236231.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155355320503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155355320507) 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, 75341026 + ... + 75343087.

It is an arithmetic number, because the mean of its divisors is an integer number (38876501412).

Almost surely, 2^155355320503 is an apocalyptic number.

155355320503 is a deficient number, since it is larger than the sum of its proper divisors (150685145).

155355320503 is a wasteful number, since it uses less digits than its factorization.

155355320503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150685144.

The product of its (nonzero) digits is 168750, while the sum is 37.

The spelling of 155355320503 in words is "one hundred fifty-five billion, three hundred fifty-five million, three hundred twenty thousand, five hundred three".