645444151 has 8 divisors (see below), whose sum is σ = 745539984. Its totient is φ = 552251520.

The previous prime is 645444139. The next prime is 645444157. The reversal of 645444151 is 151444546.

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 645444151 - 2⁵ = 645444119 is a prime.

It is a super-2 number, since 2×645444151² = 833196304120221602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645444157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1725600 + ... + 1725973.

It is an arithmetic number, because the mean of its divisors is an integer number (93192498).

Almost surely, 2^645444151 is an apocalyptic number.

645444151 is a deficient number, since it is larger than the sum of its proper divisors (100095833).

645444151 is a wasteful number, since it uses less digits than its factorization.

645444151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3451601.

The product of its digits is 38400, while the sum is 34.

The square root of 645444151 is about 25405.5929078618. The cubic root of 645444151 is about 864.2105356669.

Adding to 645444151 its reverse (151444546), we get a palindrome (796888697).

It can be divided in two parts, 6454 and 44151, that added together give a palindrome (50605).

The spelling of 645444151 in words is "six hundred forty-five million, four hundred forty-four thousand, one hundred fifty-one".