1664312643554 has 32 divisors (see below), whose sum is σ = 2740382337024. Its totient is φ = 751798074880.

The previous prime is 1664312643541. The next prime is 1664312643613. The reversal of 1664312643554 is 4553462134661.

It is a happy 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, 8554847 + ... + 8747229.

It is an arithmetic number, because the mean of its divisors is an integer number (85636948032).

Almost surely, 2^{1664312643554} is an apocalyptic number.

1664312643554 is a deficient number, since it is larger than the sum of its proper divisors (1076069693470).

1664312643554 is a wasteful number, since it uses less digits than its factorization.

1664312643554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194842.

The product of its digits is 6220800, while the sum is 50.

The spelling of 1664312643554 in words is "one trillion, six hundred sixty-four billion, three hundred twelve million, six hundred forty-three thousand, five hundred fifty-four".