1645251346 has 4 divisors (see below), whose sum is σ = 2467877022. Its totient is φ = 822625672.

The previous prime is 1645251343. The next prime is 1645251353. The reversal of 1645251346 is 6431525461.

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., 1039353121 + 605898225 = 32239^2 + 24615^2 .

It is not an unprimeable number, because it can be changed into a prime (1645251343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411312835 + ... + 411312838.

Almost surely, 2^1645251346 is an apocalyptic number.

1645251346 is a deficient number, since it is larger than the sum of its proper divisors (822625676).

1645251346 is an equidigital number, since it uses as much as digits as its factorization.

1645251346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822625675.

The product of its digits is 86400, while the sum is 37.

The square root of 1645251346 is about 40561.6980167251. The cubic root of 1645251346 is about 1180.5310608732.

The spelling of 1645251346 in words is "one billion, six hundred forty-five million, two hundred fifty-one thousand, three hundred forty-six".