1287236215206 has 20 divisors (see below), whose sum is σ = 2884362630732. Its totient is φ = 429078738348.

The previous prime is 1287236215193. The next prime is 1287236215207. The reversal of 1287236215206 is 6025126327821.

1287236215206 is a `hidden beast` number, since 1 + 2 + 8 + 72 + 36 + 21 + 520 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287236215207) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3972951120 + ... + 3972951443.

Almost surely, 2^{1287236215206} is an apocalyptic number.

1287236215206 is an abundant number, since it is smaller than the sum of its proper divisors (1597126415526).

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

1287236215206 is an equidigital number, since it uses as much as digits as its factorization.

1287236215206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7945902577 (or 7945902568 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 1287236215206 in words is "one trillion, two hundred eighty-seven billion, two hundred thirty-six million, two hundred fifteen thousand, two hundred six".