1661106567207 has 16 divisors (see below), whose sum is σ = 2216181493760. Its totient is φ = 1106718228000.

The previous prime is 1661106567199. The next prime is 1661106567217. The reversal of 1661106567207 is 7027656011661.

It is not a de Polignac number, because 1661106567207 - 2³ = 1661106567199 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 (1661106567217) 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, 34799457 + ... + 34847157.

It is an arithmetic number, because the mean of its divisors is an integer number (138511343360).

Almost surely, 2^{1661106567207} is an apocalyptic number.

1661106567207 is a deficient number, since it is larger than the sum of its proper divisors (555074926553).

1661106567207 is a wasteful number, since it uses less digits than its factorization.

1661106567207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54654.

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 1661106567207 in words is "one trillion, six hundred sixty-one billion, one hundred six million, five hundred sixty-seven thousand, two hundred seven".