645416005354 has 4 divisors (see below), whose sum is σ = 968124008034. Its totient is φ = 322708002676.

The previous prime is 645416005301. The next prime is 645416005357. The reversal of 645416005354 is 453500614546.

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., 590704456329 + 54711549025 = 768573^2 + 233905^2 .

It is a super-2 number, since 2×645416005354² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645416005354.

It is not an unprimeable number, because it can be changed into a prime (645416005357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161354001337 + ... + 161354001340.

Almost surely, 2^645416005354 is an apocalyptic number.

645416005354 is a deficient number, since it is larger than the sum of its proper divisors (322708002680).

645416005354 is a wasteful number, since it uses less digits than its factorization.

645416005354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322708002679.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 645416005354 in words is "six hundred forty-five billion, four hundred sixteen million, five thousand, three hundred fifty-four".