1051557221166 has 16 divisors (see below), whose sum is σ = 2134504210944. Its totient is φ = 345287445624.

The previous prime is 1051557221147. The next prime is 1051557221201. The reversal of 1051557221166 is 6611227551501.

It is a happy number.

It is a super-2 number, since 2×1051557221166² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1307906590 + ... + 1307907393.

It is an arithmetic number, because the mean of its divisors is an integer number (133406513184).

Almost surely, 2^{1051557221166} is an apocalyptic number.

1051557221166 is an abundant number, since it is smaller than the sum of its proper divisors (1082946989778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1051557221166 is a wasteful number, since it uses less digits than its factorization.

1051557221166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2615814055.

The product of its (nonzero) digits is 126000, while the sum is 42.

The spelling of 1051557221166 in words is "one trillion, fifty-one billion, five hundred fifty-seven million, two hundred twenty-one thousand, one hundred sixty-six".