645466051 has 4 divisors (see below), whose sum is σ = 651498552. Its totient is φ = 639433552.

The previous prime is 645466049. The next prime is 645466061. The reversal of 645466051 is 150664546.

645466051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150664546 = 2 ⋅75332273.

It is a cyclic number.

It is not a de Polignac number, because 645466051 - 2¹ = 645466049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645466051.

It is not an unprimeable number, because it can be changed into a prime (645466001) 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, 3016090 + ... + 3016303.

It is an arithmetic number, because the mean of its divisors is an integer number (162874638).

Almost surely, 2^645466051 is an apocalyptic number.

645466051 is a deficient number, since it is larger than the sum of its proper divisors (6032501).

645466051 is a wasteful number, since it uses less digits than its factorization.

645466051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6032500.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 645466051 is about 25406.0239116632. The cubic root of 645466051 is about 864.2203098132.

The spelling of 645466051 in words is "six hundred forty-five million, four hundred sixty-six thousand, fifty-one".