1645230224402 has 4 divisors (see below), whose sum is σ = 2467845336606. Its totient is φ = 822615112200.

The previous prime is 1645230224383. The next prime is 1645230224441. The reversal of 1645230224402 is 2044220325461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1636764568321 + 8465656081 = 1279361^2 + 92009^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411307556099 + ... + 411307556102.

Almost surely, 2^{1645230224402} is an apocalyptic number.

1645230224402 is a deficient number, since it is larger than the sum of its proper divisors (822615112204).

1645230224402 is an equidigital number, since it uses as much as digits as its factorization.

1645230224402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822615112203.

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 1645230224402 its reverse (2044220325461), we get a palindrome (3689450549863).

The spelling of 1645230224402 in words is "one trillion, six hundred forty-five billion, two hundred thirty million, two hundred twenty-four thousand, four hundred two".