506503511551 has 4 divisors (see below), whose sum is σ = 506581549704. Its totient is φ = 506425473400.

The previous prime is 506503511531. The next prime is 506503511581. The reversal of 506503511551 is 155115305605.

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 506503511551 - 2³⁵ = 472143773183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 506503511551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506503511531) 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, 39009340 + ... + 39022321.

It is an arithmetic number, because the mean of its divisors is an integer number (126645387426).

Almost surely, 2^506503511551 is an apocalyptic number.

506503511551 is a deficient number, since it is larger than the sum of its proper divisors (78038153).

506503511551 is an equidigital number, since it uses as much as digits as its factorization.

506503511551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78038152.

The product of its (nonzero) digits is 56250, while the sum is 37.

The spelling of 506503511551 in words is "five hundred six billion, five hundred three million, five hundred eleven thousand, five hundred fifty-one".