1664204534545 has 16 divisors (see below), whose sum is σ = 2416592803968. Its totient is φ = 1074041245440.

The previous prime is 1664204534491. The next prime is 1664204534557. The reversal of 1664204534545 is 5454354024661.

It is not a de Polignac number, because 1664204534545 - 2²⁵ = 1664170980113 is a prime.

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, 1398490611 + ... + 1398491800.

It is an arithmetic number, because the mean of its divisors is an integer number (151037050248).

Almost surely, 2^{1664204534545} is an apocalyptic number.

It is an amenable number.

1664204534545 is a deficient number, since it is larger than the sum of its proper divisors (752388269423).

1664204534545 is a wasteful number, since it uses less digits than its factorization.

1664204534545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2796982440.

The product of its (nonzero) digits is 6912000, while the sum is 49.

The spelling of 1664204534545 in words is "one trillion, six hundred sixty-four billion, two hundred four million, five hundred thirty-four thousand, five hundred forty-five".