1066115600661 has 16 divisors (see below), whose sum is σ = 1460890700864. Its totient is φ = 691068029184.

The previous prime is 1066115600653. The next prime is 1066115600723. The reversal of 1066115600661 is 1660065116601.

It is not a de Polignac number, because 1066115600661 - 2³ = 1066115600653 is a prime.

It is a super-2 number, since 2×1066115600661² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066115600611) 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, 3073636 + ... + 3402861.

It is an arithmetic number, because the mean of its divisors is an integer number (91305668804).

Almost surely, 2^{1066115600661} is an apocalyptic number.

It is an amenable number.

1066115600661 is a deficient number, since it is larger than the sum of its proper divisors (394775100203).

1066115600661 is a wasteful number, since it uses less digits than its factorization.

1066115600661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6478020.

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 1066115600661 in words is "one trillion, sixty-six billion, one hundred fifteen million, six hundred thousand, six hundred sixty-one".