661523303325166 has 16 divisors (see below), whose sum is σ = 1041085854419328. Its totient is φ = 314844512421600.

The previous prime is 661523303325163. The next prime is 661523303325169.

661523303325166 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (661523303325163) and next prime (661523303325169).

It is a super-2 number, since 2×661523303325166² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661523303325163) 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, 87456805225 + ... + 87456812788.

It is an arithmetic number, because the mean of its divisors is an integer number (65067865901208).

Almost surely, 2^{661523303325166} is an apocalyptic number.

661523303325166 is a deficient number, since it is larger than the sum of its proper divisors (379562551094162).

661523303325166 is a wasteful number, since it uses less digits than its factorization.

661523303325166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174913618107.

The product of its (nonzero) digits is 10497600, while the sum is 52.

It can be divided in two parts, 66152330 and 3325166, that added together give a palindrome (69477496).

The spelling of 661523303325166 in words is "six hundred sixty-one trillion, five hundred twenty-three billion, three hundred three million, three hundred twenty-five thousand, one hundred sixty-six".