1601105561511 has 16 divisors (see below), whose sum is σ = 2169303085824. Its totient is φ = 1050194591424.

The previous prime is 1601105561483. The next prime is 1601105561551. The reversal of 1601105561511 is 1151655011061.

It is not a de Polignac number, because 1601105561511 - 2¹⁹ = 1601105037223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601105561551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4674006 + ... + 5004851.

It is an arithmetic number, because the mean of its divisors is an integer number (135581442864).

Almost surely, 2^{1601105561511} is an apocalyptic number.

1601105561511 is a deficient number, since it is larger than the sum of its proper divisors (568197524313).

1601105561511 is an equidigital number, since it uses as much as digits as its factorization.

1601105561511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9679750.

The product of its (nonzero) digits is 4500, while the sum is 33.

The spelling of 1601105561511 in words is "one trillion, six hundred one billion, one hundred five million, five hundred sixty-one thousand, five hundred eleven".