505511660551 has 8 divisors (see below), whose sum is σ = 507422664000. Its totient is φ = 503600993280.

The previous prime is 505511660513. The next prime is 505511660579. The reversal of 505511660551 is 155066115505.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 505511660551 - 2⁹ = 505511660039 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 (505511660651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3165675 + ... + 3321523.

It is an arithmetic number, because the mean of its divisors is an integer number (63427833000).

Almost surely, 2^505511660551 is an apocalyptic number.

505511660551 is a deficient number, since it is larger than the sum of its proper divisors (1911003449).

505511660551 is a wasteful number, since it uses less digits than its factorization.

505511660551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168089.

The product of its (nonzero) digits is 112500, while the sum is 40.

The spelling of 505511660551 in words is "five hundred five billion, five hundred eleven million, six hundred sixty thousand, five hundred fifty-one".