1645613445 has 32 divisors (see below), whose sum is σ = 3010793472. Its totient is φ = 751862592.

The previous prime is 1645613423. The next prime is 1645613467. The reversal of 1645613445 is 5443165461.

It is an interprime number because it is at equal distance from previous prime (1645613423) and next prime (1645613467).

It is not a de Polignac number, because 1645613445 - 2¹⁶ = 1645547909 is a prime.

It is a super-2 number, since 2×1645613445² = 5416087220729536050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 263934 + ... + 270096.

It is an arithmetic number, because the mean of its divisors is an integer number (94087296).

Almost surely, 2^1645613445 is an apocalyptic number.

1645613445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645613445 is a deficient number, since it is larger than the sum of its proper divisors (1365180027).

1645613445 is a wasteful number, since it uses less digits than its factorization.

1645613445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8721.

The product of its digits is 172800, while the sum is 39.

The square root of 1645613445 is about 40566.1613293642. The cubic root of 1645613445 is about 1180.6176611691.

The spelling of 1645613445 in words is "one billion, six hundred forty-five million, six hundred thirteen thousand, four hundred forty-five".