1663701638 has 8 divisors (see below), whose sum is σ = 2581606080. Its totient is φ = 803166280.

The previous prime is 1663701631. The next prime is 1663701661. The reversal of 1663701638 is 8361073661.

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

It is a junction number, because it is equal to n+sod(n) for n = 1663701595 and 1663701604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663701631) 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, 14342198 + ... + 14342313.

It is an arithmetic number, because the mean of its divisors is an integer number (322700760).

Almost surely, 2^1663701638 is an apocalyptic number.

1663701638 is a deficient number, since it is larger than the sum of its proper divisors (917904442).

1663701638 is a wasteful number, since it uses less digits than its factorization.

1663701638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28684542.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 1663701638 is about 40788.4988446498. The cubic root of 1663701638 is about 1184.9275981093.

The spelling of 1663701638 in words is "one billion, six hundred sixty-three million, seven hundred one thousand, six hundred thirty-eight".