505990401565 has 16 divisors (see below), whose sum is σ = 662730247296. Its totient is φ = 367802568000.

The previous prime is 505990401529. The next prime is 505990401643. The reversal of 505990401565 is 565104099505.

It is not a de Polignac number, because 505990401565 - 2¹⁷ = 505990270493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2273361 + ... + 2485990.

It is an arithmetic number, because the mean of its divisors is an integer number (41420640456).

Almost surely, 2^505990401565 is an apocalyptic number.

505990401565 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

505990401565 is a deficient number, since it is larger than the sum of its proper divisors (156739845731).

505990401565 is a wasteful number, since it uses less digits than its factorization.

505990401565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4761300.

The product of its (nonzero) digits is 1215000, while the sum is 49.

It can be divided in two parts, 50599040 and 1565, that added together give a palindrome (50600605).

The spelling of 505990401565 in words is "five hundred five billion, nine hundred ninety million, four hundred one thousand, five hundred sixty-five".