1663607 has 4 divisors (see below), whose sum is σ = 1814856. Its totient is φ = 1512360.

The previous prime is 1663589. The next prime is 1663609. The reversal of 1663607 is 7063661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7063661 = 11 ⋅642151.

It is a cyclic number.

It is not a de Polignac number, because 1663607 - 2⁸ = 1663351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1663607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75608 + ... + 75629.

It is an arithmetic number, because the mean of its divisors is an integer number (453714).

2^1663607 is an apocalyptic number.

1663607 is a deficient number, since it is larger than the sum of its proper divisors (151249).

1663607 is a wasteful number, since it uses less digits than its factorization.

1663607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151248.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 1663607 is about 1289.8089005740. The cubic root of 1663607 is about 118.4905129877.

It can be divided in two parts, 166 and 3607, that added together give a palindrome (3773).

The spelling of 1663607 in words is "one million, six hundred sixty-three thousand, six hundred seven".