1664051264623 has 8 divisors (see below), whose sum is σ = 1815591407616. Its totient is φ = 1512554914200.

The previous prime is 1664051264543. The next prime is 1664051264627. The reversal of 1664051264623 is 3264621504661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1664051264623 - 2²¹ = 1664049167471 is a prime.

It is a super-2 number, since 2×1664051264623² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664051264627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10868661 + ... + 11020702.

It is an arithmetic number, because the mean of its divisors is an integer number (226948925952).

Almost surely, 2^{1664051264623} is an apocalyptic number.

1664051264623 is a deficient number, since it is larger than the sum of its proper divisors (151540142993).

1664051264623 is a wasteful number, since it uses less digits than its factorization.

1664051264623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21896285.

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 1664051264623 in words is "one trillion, six hundred sixty-four billion, fifty-one million, two hundred sixty-four thousand, six hundred twenty-three".