520155223442 has 4 divisors (see below), whose sum is σ = 780232835166. Its totient is φ = 260077611720.

The previous prime is 520155223421. The next prime is 520155223451. The reversal of 520155223442 is 244322551025.

It is a happy number.

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., 307227426961 + 212927796481 = 554281^2 + 461441^2 .

It is a super-2 number, since 2×520155223442² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130038805859 + ... + 130038805862.

Almost surely, 2^520155223442 is an apocalyptic number.

520155223442 is a deficient number, since it is larger than the sum of its proper divisors (260077611724).

520155223442 is a wasteful number, since it uses less digits than its factorization.

520155223442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260077611723.

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 520155223442 its reverse (244322551025), we get a palindrome (764477774467).

The spelling of 520155223442 in words is "five hundred twenty billion, one hundred fifty-five million, two hundred twenty-three thousand, four hundred forty-two".