1663351261 has 8 divisors (see below), whose sum is σ = 1954147104. Its totient is φ = 1395819120.

The previous prime is 1663351211. The next prime is 1663351297. The reversal of 1663351261 is 1621533661.

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

It is a cyclic number.

It is not a de Polignac number, because 1663351261 - 2⁷ = 1663351133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663351211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5815771 + ... + 5816056.

It is an arithmetic number, because the mean of its divisors is an integer number (244268388).

Almost surely, 2^1663351261 is an apocalyptic number.

1663351261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1663351261 is a deficient number, since it is larger than the sum of its proper divisors (290795843).

1663351261 is a wasteful number, since it uses less digits than its factorization.

1663351261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11631851.

The product of its digits is 19440, while the sum is 34.

The square root of 1663351261 is about 40784.2035719713. The cubic root of 1663351261 is about 1184.8444100111.

The spelling of 1663351261 in words is "one billion, six hundred sixty-three million, three hundred fifty-one thousand, two hundred sixty-one".