645650616451 has 8 divisors (see below), whose sum is σ = 661580900064. Its totient is φ = 629729033280.

The previous prime is 645650616449. The next prime is 645650616491. The reversal of 645650616451 is 154616056546.

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

It is a cyclic number.

It is not a de Polignac number, because 645650616451 - 2¹ = 645650616449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645650616395 and 645650616404.

It is not an unprimeable number, because it can be changed into a prime (645650616491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2024736 + ... + 2321821.

It is an arithmetic number, because the mean of its divisors is an integer number (82697612508).

Almost surely, 2^645650616451 is an apocalyptic number.

645650616451 is a deficient number, since it is larger than the sum of its proper divisors (15930283613).

645650616451 is a wasteful number, since it uses less digits than its factorization.

645650616451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350221.

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 645650616451 in words is "six hundred forty-five billion, six hundred fifty million, six hundred sixteen thousand, four hundred fifty-one".