1215125663 has 4 divisors (see below), whose sum is σ = 1216182528. Its totient is φ = 1214068800.

The previous prime is 1215125617. The next prime is 1215125669. The reversal of 1215125663 is 3665215121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1215125663 - 2⁸ = 1215125407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215125669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526706 + ... + 529007.

It is an arithmetic number, because the mean of its divisors is an integer number (304045632).

Almost surely, 2^1215125663 is an apocalyptic number.

1215125663 is a deficient number, since it is larger than the sum of its proper divisors (1056865).

1215125663 is a wasteful number, since it uses less digits than its factorization.

1215125663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056864.

The product of its digits is 10800, while the sum is 32.

The square root of 1215125663 is about 34858.6526274324. The cubic root of 1215125663 is about 1067.1047777235.

The spelling of 1215125663 in words is "one billion, two hundred fifteen million, one hundred twenty-five thousand, six hundred sixty-three".