1645054042 has 8 divisors (see below), whose sum is σ = 2474904276. Its totient is φ = 820085952.

The previous prime is 1645054031. The next prime is 1645054043. The reversal of 1645054042 is 2404505461.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1616120401 + 28933641 = 40201^2 + 5379^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1645054042² = 5412405602201075528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1645053995 and 1645054013.

It is not an unprimeable number, because it can be changed into a prime (1645054043) 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, 1219693 + ... + 1221040.

Almost surely, 2^1645054042 is an apocalyptic number.

1645054042 is a deficient number, since it is larger than the sum of its proper divisors (829850234).

1645054042 is a wasteful number, since it uses less digits than its factorization.

1645054042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441072.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 1645054042 is about 40559.2657971024. The cubic root of 1645054042 is about 1180.4838679194.

The spelling of 1645054042 in words is "one billion, six hundred forty-five million, fifty-four thousand, forty-two".