1665425065919 has 8 divisors (see below), whose sum is σ = 1706211209472. Its totient is φ = 1624646828160.

The previous prime is 1665425065883. The next prime is 1665425065939. The reversal of 1665425065919 is 9195605245661.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1665425065919 - 2⁸ = 1665425065663 is a prime.

It is a super-2 number, since 2×1665425065919² (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 (1665425065939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1548854 + ... + 2393699.

It is an arithmetic number, because the mean of its divisors is an integer number (213276401184).

Almost surely, 2^{1665425065919} is an apocalyptic number.

1665425065919 is a deficient number, since it is larger than the sum of its proper divisors (40786143553).

1665425065919 is a wasteful number, since it uses less digits than its factorization.

1665425065919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3952897.

The product of its (nonzero) digits is 17496000, while the sum is 59.

The spelling of 1665425065919 in words is "one trillion, six hundred sixty-five billion, four hundred twenty-five million, sixty-five thousand, nine hundred nineteen".