1561655450015 has 16 divisors (see below), whose sum is σ = 2030365722528. Its totient is φ = 1148489696256.

The previous prime is 1561655450009. The next prime is 1561655450077. The reversal of 1561655450015 is 5100545561651.

It is a cyclic number.

It is not a de Polignac number, because 1561655450015 - 2¹² = 1561655445919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213629102 + ... + 213636411.

It is an arithmetic number, because the mean of its divisors is an integer number (126897857658).

Almost surely, 2^{1561655450015} is an apocalyptic number.

1561655450015 is a deficient number, since it is larger than the sum of its proper divisors (468710272513).

1561655450015 is a wasteful number, since it uses less digits than its factorization.

1561655450015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427265578.

The product of its (nonzero) digits is 450000, while the sum is 44.

The spelling of 1561655450015 in words is "one trillion, five hundred sixty-one billion, six hundred fifty-five million, four hundred fifty thousand, fifteen".