645236445461 has 8 divisors (see below), whose sum is σ = 679308698880. Its totient is φ = 611175436128.

The previous prime is 645236445449. The next prime is 645236445599. The reversal of 645236445461 is 164544632546.

It is a happy number.

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 645236445461 - 2⁶ = 645236445397 is a prime.

It is a super-2 number, since 2×645236445461² (a number of 24 digits) 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 (645236445961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2693096 + ... + 2922881.

It is an arithmetic number, because the mean of its divisors is an integer number (84913587360).

Almost surely, 2^645236445461 is an apocalyptic number.

It is an amenable number.

645236445461 is a deficient number, since it is larger than the sum of its proper divisors (34072253419).

645236445461 is a wasteful number, since it uses less digits than its factorization.

645236445461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5622043.

The product of its digits is 8294400, while the sum is 50.

The spelling of 645236445461 in words is "six hundred forty-five billion, two hundred thirty-six million, four hundred forty-five thousand, four hundred sixty-one".