1645355642 has 16 divisors (see below), whose sum is σ = 2986528320. Its totient is φ = 663672768.

The previous prime is 1645355639. The next prime is 1645355683. The reversal of 1645355642 is 2465535461.

It is a happy number.

It is a super-2 number, since 2×1645355642² = 5414390377322464328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1645355642.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3456392 + ... + 3456867.

It is an arithmetic number, because the mean of its divisors is an integer number (186658020).

Almost surely, 2^1645355642 is an apocalyptic number.

1645355642 is a deficient number, since it is larger than the sum of its proper divisors (1341172678).

1645355642 is a wasteful number, since it uses less digits than its factorization.

1645355642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6913285.

The product of its digits is 432000, while the sum is 41.

The square root of 1645355642 is about 40562.9836427253. The cubic root of 1645355642 is about 1180.5560058086.

The spelling of 1645355642 in words is "one billion, six hundred forty-five million, three hundred fifty-five thousand, six hundred forty-two".