1664154180441 has 9 divisors (see below), whose sum is σ = 2403783850741. Its totient is φ = 1109433540252.

The previous prime is 1664154180433. The next prime is 1664154180487. The reversal of 1664154180441 is 1440814514661.

The square root of 1664154180441 is 1290021.

It is a perfect power (a square), and thus also a powerful number.

1664154180441 is a `hidden beast` number, since 1 + 6 + 64 + 1 + 541 + 8 + 0 + 4 + 41 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1664154180441 - 2³ = 1664154180433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664154180401) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3655060 + ... + 4085066.

Almost surely, 2^{1664154180441} is an apocalyptic number.

1664154180441 is the 1290021-st square number.

1664154180441 is the 645011-st centered octagonal number.

It is an amenable number.

1664154180441 is a deficient number, since it is larger than the sum of its proper divisors (739629670300).

1664154180441 is an frugal number, since it uses more digits than its factorization.

1664154180441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860020 (or 430010 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 1664154180441 in words is "one trillion, six hundred sixty-four billion, one hundred fifty-four million, one hundred eighty thousand, four hundred forty-one".