505990401505 has 16 divisors (see below), whose sum is σ = 658586076624. Its totient is φ = 371688785920.

The previous prime is 505990401503. The next prime is 505990401529. The reversal of 505990401505 is 505104099505.

It can be written as a sum of positive squares in 8 ways, for example, as 1437319744 + 504553081761 = 37912^2 + 710319^2 .

It is not a de Polignac number, because 505990401505 - 2¹ = 505990401503 is a prime.

It is a super-2 number, since 2×505990401505² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505990401503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72591982 + ... + 72598951.

It is an arithmetic number, because the mean of its divisors is an integer number (41161629789).

Almost surely, 2^505990401505 is an apocalyptic number.

It is an amenable number.

505990401505 is a deficient number, since it is larger than the sum of its proper divisors (152595675119).

505990401505 is a wasteful number, since it uses less digits than its factorization.

505990401505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145190996.

The product of its (nonzero) digits is 202500, while the sum is 43.

The spelling of 505990401505 in words is "five hundred five billion, nine hundred ninety million, four hundred one thousand, five hundred five".