1661206116526 has 32 divisors (see below), whose sum is σ = 2732416727040. Its totient is φ = 751183524000.

The previous prime is 1661206116509. The next prime is 1661206116527. The reversal of 1661206116526 is 6256116021661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661206116527) 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, 76055115 + ... + 76076953.

It is an arithmetic number, because the mean of its divisors is an integer number (85388022720).

Almost surely, 2^{1661206116526} is an apocalyptic number.

1661206116526 is a deficient number, since it is larger than the sum of its proper divisors (1071210610514).

1661206116526 is a wasteful number, since it uses less digits than its factorization.

1661206116526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39600.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 1661206116526 in words is "one trillion, six hundred sixty-one billion, two hundred six million, one hundred sixteen thousand, five hundred twenty-six".