1215120668 has 6 divisors (see below), whose sum is σ = 2126461176. Its totient is φ = 607560332.

The previous prime is 1215120667. The next prime is 1215120691. The reversal of 1215120668 is 8660215121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215120667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151890080 + ... + 151890087.

It is an arithmetic number, because the mean of its divisors is an integer number (354410196).

Almost surely, 2^1215120668 is an apocalyptic number.

It is an amenable number.

1215120668 is a deficient number, since it is larger than the sum of its proper divisors (911340508).

1215120668 is a wasteful number, since it uses less digits than its factorization.

1215120668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303780171 (or 303780169 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 1215120668 is about 34858.5809808718. The cubic root of 1215120668 is about 1067.1033155440.

Adding to 1215120668 its reverse (8660215121), we get a palindrome (9875335789).

The spelling of 1215120668 in words is "one billion, two hundred fifteen million, one hundred twenty thousand, six hundred sixty-eight".