1664215622532 has 36 divisors (see below), whose sum is σ = 4207371715456. Its totient is φ = 554658833520.

The previous prime is 1664215622527. The next prime is 1664215622549. The reversal of 1664215622532 is 2352265124661.

1664215622532 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 2 + 15 + 622 + 5 + 3 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1664215622532² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3066844 + ... + 3568467.

Almost surely, 2^{1664215622532} is an apocalyptic number.

1664215622532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1664215622532 is an abundant number, since it is smaller than the sum of its proper divisors (2543156092924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664215622532 is a wasteful number, since it uses less digits than its factorization.

1664215622532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6642288 (or 6642283 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The spelling of 1664215622532 in words is "one trillion, six hundred sixty-four billion, two hundred fifteen million, six hundred twenty-two thousand, five hundred thirty-two".