1561655560215 has 32 divisors (see below), whose sum is σ = 2517076705536. Its totient is φ = 826741280000.

The previous prime is 1561655560207. The next prime is 1561655560219. The reversal of 1561655560215 is 5120655561651.

It is not a de Polignac number, because 1561655560215 - 2³ = 1561655560207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561655560219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43060840 + ... + 43097090.

It is an arithmetic number, because the mean of its divisors is an integer number (78658647048).

Almost surely, 2^{1561655560215} is an apocalyptic number.

1561655560215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1561655560215 is a deficient number, since it is larger than the sum of its proper divisors (955421145321).

1561655560215 is a wasteful number, since it uses less digits than its factorization.

1561655560215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57359.

The product of its (nonzero) digits is 1350000, while the sum is 48.

The spelling of 1561655560215 in words is "one trillion, five hundred sixty-one billion, six hundred fifty-five million, five hundred sixty thousand, two hundred fifteen".