661251201122 has 16 divisors (see below), whose sum is σ = 1005918668352. Its totient is φ = 325973260560.

The previous prime is 661251201119. The next prime is 661251201167. The reversal of 661251201122 is 221102152166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7023629 + ... + 7117152.

It is an arithmetic number, because the mean of its divisors is an integer number (62869916772).

Almost surely, 2^661251201122 is an apocalyptic number.

661251201122 is a deficient number, since it is larger than the sum of its proper divisors (344667467230).

661251201122 is a wasteful number, since it uses less digits than its factorization.

661251201122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14141113.

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 661251201122 its reverse (221102152166), we get a palindrome (882353353288).

The spelling of 661251201122 in words is "six hundred sixty-one billion, two hundred fifty-one million, two hundred one thousand, one hundred twenty-two".