1664157896764 has 12 divisors (see below), whose sum is σ = 3177028712088. Its totient is φ = 756435407600.

The previous prime is 1664157896701. The next prime is 1664157896767. The reversal of 1664157896764 is 4676987514661.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1664157896693 and 1664157896702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664157896767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18910885147 + ... + 18910885234.

It is an arithmetic number, because the mean of its divisors is an integer number (264752392674).

Almost surely, 2^{1664157896764} is an apocalyptic number.

It is an amenable number.

1664157896764 is a deficient number, since it is larger than the sum of its proper divisors (1512870815324).

1664157896764 is a wasteful number, since it uses less digits than its factorization.

1664157896764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37821770396 (or 37821770394 counting only the distinct ones).

The product of its digits is 365783040, while the sum is 70.

The spelling of 1664157896764 in words is "one trillion, six hundred sixty-four billion, one hundred fifty-seven million, eight hundred ninety-six thousand, seven hundred sixty-four".