1641402500 has 30 divisors (see below), whose sum is σ = 3589424454. Its totient is φ = 656560000.

The previous prime is 1641402467. The next prime is 1641402517. The reversal of 1641402500 is 52041461.

It can be written as a sum of positive squares in 5 ways, for example, as 582160384 + 1059242116 = 24128^2 + 32546^2 .

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 9 ways as a sum of consecutive naturals, for example, 325781 + ... + 330780.

Almost surely, 2^1641402500 is an apocalyptic number.

1641402500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641402500 is an abundant number, since it is smaller than the sum of its proper divisors (1948021954).

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

1641402500 is an equidigital number, since it uses as much as digits as its factorization.

1641402500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656585 (or 656568 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1641402500 is about 40514.2258965909. The cubic root of 1641402500 is about 1179.6097771258.

Adding to 1641402500 its reverse (52041461), we get a palindrome (1693443961).

The spelling of 1641402500 in words is "one billion, six hundred forty-one million, four hundred two thousand, five hundred".