1215051561686 has 64 divisors (see below), whose sum is σ = 1949875200000. Its totient is φ = 566204569632.

The previous prime is 1215051561679. The next prime is 1215051561697. The reversal of 1215051561686 is 6861651505121.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215051561686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1169442755 + ... + 1169443793.

It is an arithmetic number, because the mean of its divisors is an integer number (30466800000).

Almost surely, 2^{1215051561686} is an apocalyptic number.

1215051561686 is a deficient number, since it is larger than the sum of its proper divisors (734823638314).

1215051561686 is a wasteful number, since it uses less digits than its factorization.

1215051561686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2361.

The product of its (nonzero) digits is 432000, while the sum is 47.

The spelling of 1215051561686 in words is "one trillion, two hundred fifteen billion, fifty-one million, five hundred sixty-one thousand, six hundred eighty-six".