1664354246165 has 16 divisors (see below), whose sum is σ = 2191440022128. Its totient is φ = 1205871753216.

The previous prime is 1664354246153. The next prime is 1664354246173. The reversal of 1664354246165 is 5616424534661.

It can be written as a sum of positive squares in 8 ways, for example, as 19050348529 + 1645303897636 = 138023^2 + 1282694^2 .

It is not a de Polignac number, because 1664354246165 - 2⁶ = 1664354246101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241557404 + ... + 241564293.

It is an arithmetic number, because the mean of its divisors is an integer number (136965001383).

Almost surely, 2^{1664354246165} is an apocalyptic number.

It is an amenable number.

1664354246165 is a deficient number, since it is larger than the sum of its proper divisors (527085775963).

1664354246165 is a wasteful number, since it uses less digits than its factorization.

1664354246165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483121768.

The product of its digits is 12441600, while the sum is 53.

The spelling of 1664354246165 in words is "one trillion, six hundred sixty-four billion, three hundred fifty-four million, two hundred forty-six thousand, one hundred sixty-five".