1663602402 has 128 divisors (see below), whose sum is σ = 4253534208. Its totient is φ = 421286400.

The previous prime is 1663602379. The next prime is 1663602403. The reversal of 1663602402 is 2042063661.

It is a self number, because there is not a number n which added to its sum of digits gives 1663602402.

It is not an unprimeable number, because it can be changed into a prime (1663602403) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3608452 + ... + 3608912.

It is an arithmetic number, because the mean of its divisors is an integer number (33230736).

Almost surely, 2^1663602402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663602402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2126767104).

1663602402 is an abundant number, since it is smaller than the sum of its proper divisors (2589931806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663602402 is a wasteful number, since it uses less digits than its factorization.

1663602402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 1663602402 is about 40787.2823561463. The cubic root of 1663602402 is about 1184.9040382332.

The spelling of 1663602402 in words is "one billion, six hundred sixty-three million, six hundred two thousand, four hundred two".