16526623605661 has 16 divisors (see below), whose sum is σ = 18412232070960. Its totient is φ = 14728811328000.

The previous prime is 16526623605659. The next prime is 16526623605697. The reversal of 16526623605661 is 16650632662561.

It can be written as a sum of positive squares in 8 ways, for example, as 3801743437636 + 12724880168025 = 1949806^2 + 3567195^2 .

It is a cyclic number.

It is not a de Polignac number, because 16526623605661 - 2¹ = 16526623605659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16526623605641) 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, 10937161 + ... + 12356161.

It is an arithmetic number, because the mean of its divisors is an integer number (1150764504435).

Almost surely, 2^{16526623605661} is an apocalyptic number.

It is an amenable number.

16526623605661 is a deficient number, since it is larger than the sum of its proper divisors (1885608465299).

16526623605661 is a wasteful number, since it uses less digits than its factorization.

16526623605661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449936.

The product of its (nonzero) digits is 13996800, while the sum is 55.

The spelling of 16526623605661 in words is "sixteen trillion, five hundred twenty-six billion, six hundred twenty-three million, six hundred five thousand, six hundred sixty-one".