1663157905 has 16 divisors (see below), whose sum is σ = 2088405504. Its totient is φ = 1269959040.

The previous prime is 1663157887. The next prime is 1663157911. The reversal of 1663157905 is 5097513661.

It is a happy number.

It is not a de Polignac number, because 1663157905 - 2¹³ = 1663149713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62179 + ... + 84808.

It is an arithmetic number, because the mean of its divisors is an integer number (130525344).

Almost surely, 2^1663157905 is an apocalyptic number.

It is an amenable number.

1663157905 is a deficient number, since it is larger than the sum of its proper divisors (425247599).

1663157905 is a wasteful number, since it uses less digits than its factorization.

1663157905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147096.

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 1663157905 is about 40781.8330264837. The cubic root of 1663157905 is about 1184.7984975493.

The spelling of 1663157905 in words is "one billion, six hundred sixty-three million, one hundred fifty-seven thousand, nine hundred five".