645270051676541 has 8 divisors (see below), whose sum is σ = 662747920643640. Its totient is φ = 627794189964288.

The previous prime is 645270051676499. The next prime is 645270051676597. The reversal of 645270051676541 is 145676150072546.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 233250936228025 + 412019115448516 = 15272555^2 + 20298254^2 .

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 645270051676541 - 2²² = 645270047482237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645270051676141) 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, 501162056 + ... + 502447953.

It is an arithmetic number, because the mean of its divisors is an integer number (82843490080455).

Almost surely, 2^{645270051676541} is an apocalyptic number.

It is an amenable number.

645270051676541 is a deficient number, since it is larger than the sum of its proper divisors (17477868967099).

645270051676541 is a wasteful number, since it uses less digits than its factorization.

645270051676541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003627423.

The product of its (nonzero) digits is 42336000, while the sum is 59.

The spelling of 645270051676541 in words is "six hundred forty-five trillion, two hundred seventy billion, fifty-one million, six hundred seventy-six thousand, five hundred forty-one".