1664899550433 has 96 divisors (see below), whose sum is σ = 2818936020992. Its totient is φ = 927260006400.

The previous prime is 1664899550351. The next prime is 1664899550449. The reversal of 1664899550433 is 3340559984661.

1664899550433 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 8 + 9 + 95 + 504 + 33 = 666.

It is not a de Polignac number, because 1664899550433 - 2¹² = 1664899546337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (1664899550933) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 533449113 + ... + 533452233.

Almost surely, 2^{1664899550433} is an apocalyptic number.

It is an amenable number.

1664899550433 is a deficient number, since it is larger than the sum of its proper divisors (1154036470559).

1664899550433 is a wasteful number, since it uses less digits than its factorization.

1664899550433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415 (or 4412 counting only the distinct ones).

The product of its (nonzero) digits is 83980800, while the sum is 63.

The spelling of 1664899550433 in words is "one trillion, six hundred sixty-four billion, eight hundred ninety-nine million, five hundred fifty thousand, four hundred thirty-three".