663541870 has 16 divisors (see below), whose sum is σ = 1212203088. Its totient is φ = 261455040.

The previous prime is 663541859. The next prime is 663541873. The reversal of 663541870 is 78145366.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663541873) 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, 494511 + ... + 495850.

It is an arithmetic number, because the mean of its divisors is an integer number (75762693).

Almost surely, 2^663541870 is an apocalyptic number.

663541870 is a deficient number, since it is larger than the sum of its proper divisors (548661218).

663541870 is a wasteful number, since it uses less digits than its factorization.

663541870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990435.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 663541870 is about 25759.3064735835. The cubic root of 663541870 is about 872.2134460165.

The spelling of 663541870 in words is "six hundred sixty-three million, five hundred forty-one thousand, eight hundred seventy".