16661235012057 has 6 divisors (see below), whose sum is σ = 24066228350762. Its totient is φ = 11107490008032.

The previous prime is 16661235012041. The next prime is 16661235012061. The reversal of 16661235012057 is 75021053216661.

It can be written as a sum of positive squares in only one way, i.e., 15661932890256 + 999302121801 = 3957516^2 + 999651^2 .

It is not a de Polignac number, because 16661235012057 - 2⁴ = 16661235012041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16661235019057) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 925624167328 + ... + 925624167345.

Almost surely, 2^{16661235012057} is an apocalyptic number.

It is an amenable number.

16661235012057 is a deficient number, since it is larger than the sum of its proper divisors (7404993338705).

16661235012057 is a wasteful number, since it uses less digits than its factorization.

16661235012057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851248334679 (or 1851248334676 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 16661235012057 in words is "sixteen trillion, six hundred sixty-one billion, two hundred thirty-five million, twelve thousand, fifty-seven".