521162506061 has 4 divisors (see below), whose sum is σ = 522638887452. Its totient is φ = 519686124672.

The previous prime is 521162506031. The next prime is 521162506063. The reversal of 521162506061 is 160605261125.

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

It can be written as a sum of positive squares in 2 ways, for example, as 238431030436 + 282731475625 = 488294^2 + 531725^2 .

It is a cyclic number.

It is not a de Polignac number, because 521162506061 - 2²⁶ = 521095397197 is a prime.

It is a super-2 number, since 2×521162506061² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521162506063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738190166 + ... + 738190871.

It is an arithmetic number, because the mean of its divisors is an integer number (130659721863).

Almost surely, 2^521162506061 is an apocalyptic number.

It is an amenable number.

521162506061 is a deficient number, since it is larger than the sum of its proper divisors (1476381391).

521162506061 is a wasteful number, since it uses less digits than its factorization.

521162506061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476381390.

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 521162506061 its reverse (160605261125), we get a palindrome (681767767186).

The spelling of 521162506061 in words is "five hundred twenty-one billion, one hundred sixty-two million, five hundred six thousand, sixty-one".