505661511 has 4 divisors (see below), whose sum is σ = 674215352. Its totient is φ = 337107672.

The previous prime is 505661483. The next prime is 505661521. The reversal of 505661511 is 115166505.

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

It is not a de Polignac number, because 505661511 - 2⁵ = 505661479 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 (505661521) 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, 84276916 + ... + 84276921.

It is an arithmetic number, because the mean of its divisors is an integer number (168553838).

Almost surely, 2^505661511 is an apocalyptic number.

505661511 is a deficient number, since it is larger than the sum of its proper divisors (168553841).

505661511 is a wasteful number, since it uses less digits than its factorization.

505661511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168553840.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 505661511 is about 22486.9186639699. The cubic root of 505661511 is about 796.6849859722.

The spelling of 505661511 in words is "five hundred five million, six hundred sixty-one thousand, five hundred eleven".