1561815216103 has 8 divisors (see below), whose sum is σ = 1615750844400. Its totient is φ = 1507884916608.

The previous prime is 1561815216097. The next prime is 1561815216121. The reversal of 1561815216103 is 3016125181651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561815216103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561815216193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 731301 + ... + 1912702.

It is an arithmetic number, because the mean of its divisors is an integer number (201968855550).

Almost surely, 2^{1561815216103} is an apocalyptic number.

1561815216103 is a deficient number, since it is larger than the sum of its proper divisors (53935628297).

1561815216103 is a wasteful number, since it uses less digits than its factorization.

1561815216103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2664401.

The product of its (nonzero) digits is 43200, while the sum is 40.

The spelling of 1561815216103 in words is "one trillion, five hundred sixty-one billion, eight hundred fifteen million, two hundred sixteen thousand, one hundred three".