505351403661 has 8 divisors (see below), whose sum is σ = 725632784800. Its totient is φ = 310985479152.

The previous prime is 505351403653. The next prime is 505351403671. The reversal of 505351403661 is 166304153505.

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

It is not a de Polignac number, because 505351403661 - 2³ = 505351403653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 12957728299 = 505351403661 / (5 + 0 + 5 + 3 + 5 + 1 + 4 + 0 + 3 + 6 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505351403671) 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, 6478864111 + ... + 6478864188.

It is an arithmetic number, because the mean of its divisors is an integer number (90704098100).

Almost surely, 2^505351403661 is an apocalyptic number.

It is an amenable number.

505351403661 is a deficient number, since it is larger than the sum of its proper divisors (220281381139).

505351403661 is a wasteful number, since it uses less digits than its factorization.

505351403661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12957728315.

The product of its (nonzero) digits is 162000, while the sum is 39.

The spelling of 505351403661 in words is "five hundred five billion, three hundred fifty-one million, four hundred three thousand, six hundred sixty-one".