1281664610 has 8 divisors (see below), whose sum is σ = 2306996316. Its totient is φ = 512665840.

The previous prime is 1281664547. The next prime is 1281664639. The reversal of 1281664610 is 164661821.

It can be written as a sum of positive squares in 2 ways, for example, as 1268998129 + 12666481 = 35623^2 + 3559^2 .

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

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 64083221 + ... + 64083240.

Almost surely, 2^1281664610 is an apocalyptic number.

1281664610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1281664610 is a deficient number, since it is larger than the sum of its proper divisors (1025331706).

1281664610 is a wasteful number, since it uses less digits than its factorization.

1281664610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128166468.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1281664610 is about 35800.3437134338. The cubic root of 1281664610 is about 1086.2375142850.

The spelling of 1281664610 in words is "one billion, two hundred eighty-one million, six hundred sixty-four thousand, six hundred ten".