1561041656111 has 8 divisors (see below), whose sum is σ = 1787594425344. Its totient is φ = 1335375591480.

The previous prime is 1561041656099. The next prime is 1561041656113. The reversal of 1561041656111 is 1116561401651.

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

It is not a de Polignac number, because 1561041656111 - 2¹⁴ = 1561041639727 is a prime.

It is a super-2 number, since 2×1561041656111² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561041656113) 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, 221672375 + ... + 221679416.

It is an arithmetic number, because the mean of its divisors is an integer number (223449303168).

Almost surely, 2^{1561041656111} is an apocalyptic number.

1561041656111 is a deficient number, since it is larger than the sum of its proper divisors (226552769233).

1561041656111 is an equidigital number, since it uses as much as digits as its factorization.

1561041656111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443352301.

The product of its (nonzero) digits is 21600, while the sum is 38.

The spelling of 1561041656111 in words is "one trillion, five hundred sixty-one billion, forty-one million, six hundred fifty-six thousand, one hundred eleven".