645632445451 has 8 divisors (see below), whose sum is σ = 739406085120. Its totient is φ = 552243914088.

The previous prime is 645632445421. The next prime is 645632445457. The reversal of 645632445451 is 154544236546.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645632445451 is a prime.

It is a super-4 number, since 4×645632445451⁴ (a number of 48 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645632445395 and 645632445404.

It is not an unprimeable number, because it can be changed into a prime (645632445457) 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, 96273481 + ... + 96280186.

It is an arithmetic number, because the mean of its divisors is an integer number (92425760640).

Almost surely, 2^645632445451 is an apocalyptic number.

645632445451 is a deficient number, since it is larger than the sum of its proper divisors (93773639669).

645632445451 is a wasteful number, since it uses less digits than its factorization.

645632445451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192554153.

The product of its digits is 6912000, while the sum is 49.

The spelling of 645632445451 in words is "six hundred forty-five billion, six hundred thirty-two million, four hundred forty-five thousand, four hundred fifty-one".