65100000011661 has 128 divisors (see below), whose sum is σ = 102970517760000. Its totient is φ = 40587155481600.

The previous prime is 65100000011623. The next prime is 65100000011743. The reversal of 65100000011661 is 16611000000156.

65100000011661 is a `hidden beast` number, since 651 + 0 + 0 + 0 + 0 + 0 + 0 + 1 + 1 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 65100000011661 - 2²⁷ = 65099865793933 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65100000012661) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 680935915 + ... + 681031511.

It is an arithmetic number, because the mean of its divisors is an integer number (804457170000).

Almost surely, 2^{65100000011661} is an apocalyptic number.

It is an amenable number.

65100000011661 is a deficient number, since it is larger than the sum of its proper divisors (37870517748339).

65100000011661 is a wasteful number, since it uses less digits than its factorization.

65100000011661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95924 (or 95918 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The spelling of 65100000011661 in words is "sixty-five trillion, one hundred billion, eleven thousand, six hundred sixty-one".