1257216166 has 8 divisors (see below), whose sum is σ = 1896360120. Its totient is φ = 625096128.

The previous prime is 1257216157. The next prime is 1257216167. The reversal of 1257216166 is 6616127521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257216167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1755531 + ... + 1756246.

It is an arithmetic number, because the mean of its divisors is an integer number (237045015).

Almost surely, 2^1257216166 is an apocalyptic number.

1257216166 is a deficient number, since it is larger than the sum of its proper divisors (639143954).

1257216166 is a wasteful number, since it uses less digits than its factorization.

1257216166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3511958.

The product of its digits is 30240, while the sum is 37.

The square root of 1257216166 is about 35457.2441963557. The cubic root of 1257216166 is about 1079.2862699684.

The spelling of 1257216166 in words is "one billion, two hundred fifty-seven million, two hundred sixteen thousand, one hundred sixty-six".