1621707066 has 24 divisors (see below), whose sum is σ = 4015655904. Its totient is φ = 463344840.

The previous prime is 1621707029. The next prime is 1621707097. The reversal of 1621707066 is 6607071261.

It is a self number, because there is not a number n which added to its sum of digits gives 1621707066.

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 11 ways as a sum of consecutive naturals, for example, 6435220 + ... + 6435471.

It is an arithmetic number, because the mean of its divisors is an integer number (167318996).

Almost surely, 2^1621707066 is an apocalyptic number.

1621707066 is an abundant number, since it is smaller than the sum of its proper divisors (2393948838).

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

1621707066 is a wasteful number, since it uses less digits than its factorization.

1621707066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12870706 (or 12870703 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 1621707066 is about 40270.4242093376. The cubic root of 1621707066 is about 1174.8726745388.

The spelling of 1621707066 in words is "one billion, six hundred twenty-one million, seven hundred seven thousand, sixty-six".