1212666457 has 8 divisors (see below), whose sum is σ = 1284330600. Its totient is φ = 1141039104.

The previous prime is 1212666443. The next prime is 1212666479. The reversal of 1212666457 is 7546662121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 88003161 + 1124663296 = 9381^2 + 33536^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1212666457 - 2¹⁵ = 1212633689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212666487) 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, 88269 + ... + 101077.

It is an arithmetic number, because the mean of its divisors is an integer number (160541325).

Almost surely, 2^1212666457 is an apocalyptic number.

1212666457 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1212666457 is a deficient number, since it is larger than the sum of its proper divisors (71664143).

1212666457 is a wasteful number, since it uses less digits than its factorization.

1212666457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18395.

The product of its digits is 120960, while the sum is 40.

The square root of 1212666457 is about 34823.3607941566. The cubic root of 1212666457 is about 1066.3844125037.

The spelling of 1212666457 in words is "one billion, two hundred twelve million, six hundred sixty-six thousand, four hundred fifty-seven".