1215051561687 has 16 divisors (see below), whose sum is σ = 1690534886400. Its totient is φ = 774802487712.

The previous prime is 1215051561679. The next prime is 1215051561697. The reversal of 1215051561687 is 7861651505121.

It is not a de Polignac number, because 1215051561687 - 2³ = 1215051561679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215051561697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5606793 + ... + 5819469.

It is an arithmetic number, because the mean of its divisors is an integer number (105658430400).

Almost surely, 2^{1215051561687} is an apocalyptic number.

1215051561687 is a deficient number, since it is larger than the sum of its proper divisors (475483324713).

1215051561687 is a wasteful number, since it uses less digits than its factorization.

1215051561687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295502.

The product of its (nonzero) digits is 504000, while the sum is 48.

The spelling of 1215051561687 in words is "one trillion, two hundred fifteen billion, fifty-one million, five hundred sixty-one thousand, six hundred eighty-seven".