15506166061 has 2 divisors, whose sum is σ = 15506166062. Its totient is φ = 15506166060.

The previous prime is 15506166043. The next prime is 15506166083. The reversal of 15506166061 is 16066160551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11810255625 + 3695910436 = 108675^2 + 60794^2 .

It is a cyclic number.

It is not a de Polignac number, because 15506166061 - 2¹³ = 15506157869 is a prime.

It is a super-2 number, since 2×15506166061² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15506166061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15506166041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7753083030 + 7753083031.

It is an arithmetic number, because the mean of its divisors is an integer number (7753083031).

Almost surely, 2^15506166061 is an apocalyptic number.

It is an amenable number.

15506166061 is a deficient number, since it is larger than the sum of its proper divisors (1).

15506166061 is an equidigital number, since it uses as much as digits as its factorization.

15506166061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 37.

It can be divided in two parts, 155061 and 66061, that added together give a palindrome (221122).

The spelling of 15506166061 in words is "fifteen billion, five hundred six million, one hundred sixty-six thousand, sixty-one".