1645445452537 has 8 divisors (see below), whose sum is σ = 1650683884032. Its totient is φ = 1640207322000.

The previous prime is 1645445452523. The next prime is 1645445452571. The reversal of 1645445452537 is 7352545445461.

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 a de Polignac number, because none of the positive numbers 2^k-1645445452537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645445752537) 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, 17054362 + ... + 17150572.

It is an arithmetic number, because the mean of its divisors is an integer number (206335485504).

Almost surely, 2^{1645445452537} is an apocalyptic number.

It is an amenable number.

1645445452537 is a deficient number, since it is larger than the sum of its proper divisors (5238431495).

1645445452537 is an equidigital number, since it uses as much as digits as its factorization.

1645445452537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150479.

The product of its digits is 40320000, while the sum is 55.

The spelling of 1645445452537 in words is "one trillion, six hundred forty-five billion, four hundred forty-five million, four hundred fifty-two thousand, five hundred thirty-seven".