1645041457 has 4 divisors (see below), whose sum is σ = 1659599460. Its totient is φ = 1630483456.

The previous prime is 1645041449. The next prime is 1645041511. The reversal of 1645041457 is 7541405461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16192576 + 1628848881 = 4024^2 + 40359^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645041457 - 2³ = 1645041449 is a prime.

It is a super-3 number, since 3×1645041457³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645071457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7278832 + ... + 7279057.

It is an arithmetic number, because the mean of its divisors is an integer number (414899865).

Almost surely, 2^1645041457 is an apocalyptic number.

It is an amenable number.

1645041457 is a deficient number, since it is larger than the sum of its proper divisors (14558003).

1645041457 is a wasteful number, since it uses less digits than its factorization.

1645041457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14558002.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 1645041457 is about 40559.1106534648. The cubic root of 1645041457 is about 1180.4808575974.

The spelling of 1645041457 in words is "one billion, six hundred forty-five million, forty-one thousand, four hundred fifty-seven".