661422202224166 has 4 divisors (see below), whose sum is σ = 992133303336252. Its totient is φ = 330711101112082.

The previous prime is 661422202224137. The next prime is 661422202224247.

661422202224166 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165355550556040 + ... + 165355550556043.

It is an arithmetic number, because the mean of its divisors is an integer number (248033325834063).

Almost surely, 2^{661422202224166} is an apocalyptic number.

661422202224166 is a deficient number, since it is larger than the sum of its proper divisors (330711101112086).

661422202224166 is a wasteful number, since it uses less digits than its factorization.

661422202224166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330711101112085.

The product of its (nonzero) digits is 1327104, while the sum is 46.

It can be divided in two parts, 66142220 and 2224166, that added together give a palindrome (68366386).

The spelling of 661422202224166 in words is "six hundred sixty-one trillion, four hundred twenty-two billion, two hundred two million, two hundred twenty-four thousand, one hundred sixty-six".