505123651442 has 4 divisors (see below), whose sum is σ = 757685477166. Its totient is φ = 252561825720.

The previous prime is 505123651433. The next prime is 505123651471. The reversal of 505123651442 is 244156321505.

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

It can be written as a sum of positive squares in only one way, i.e., 258957836641 + 246165814801 = 508879^2 + 496151^2 .

It is a junction number, because it is equal to n+sod(n) for n = 505123651396 and 505123651405.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126280912859 + ... + 126280912862.

Almost surely, 2^505123651442 is an apocalyptic number.

505123651442 is a deficient number, since it is larger than the sum of its proper divisors (252561825724).

505123651442 is a wasteful number, since it uses less digits than its factorization.

505123651442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252561825723.

The product of its (nonzero) digits is 144000, while the sum is 38.

Adding to 505123651442 its reverse (244156321505), we get a palindrome (749279972947).

The spelling of 505123651442 in words is "five hundred five billion, one hundred twenty-three million, six hundred fifty-one thousand, four hundred forty-two".