1664424785115 has 48 divisors (see below), whose sum is σ = 3059789428800. Its totient is φ = 835178192640.

The previous prime is 1664424785071. The next prime is 1664424785129. The reversal of 1664424785115 is 5115874244661.

1664424785115 is a `hidden beast` number, since 1 + 6 + 6 + 442 + 4 + 7 + 85 + 115 = 666.

It is not a de Polignac number, because 1664424785115 - 2¹⁰ = 1664424784091 is a prime.

It is a super-2 number, since 2×1664424785115² (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 47 ways as a sum of consecutive naturals, for example, 13118340 + ... + 13244609.

It is an arithmetic number, because the mean of its divisors is an integer number (63745613100).

Almost surely, 2^{1664424785115} is an apocalyptic number.

1664424785115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1664424785115 is a deficient number, since it is larger than the sum of its proper divisors (1395364643685).

1664424785115 is a wasteful number, since it uses less digits than its factorization.

1664424785115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26363044 (or 26363041 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 54.

The spelling of 1664424785115 in words is "one trillion, six hundred sixty-four billion, four hundred twenty-four million, seven hundred eighty-five thousand, one hundred fifteen".