1645445452536 has 128 divisors (see below), whose sum is σ = 4770513792000. Its totient is φ = 524513049984.

The previous prime is 1645445452523. The next prime is 1645445452571. The reversal of 1645445452536 is 6352545445461.

1645445452536 is a `hidden beast` number, since 1 + 6 + 4 + 5 + 4 + 4 + 54 + 52 + 536 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22732210 + ... + 22804478.

It is an arithmetic number, because the mean of its divisors is an integer number (37269639000).

Almost surely, 2^{1645445452536} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645445452536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2385256896000).

1645445452536 is an abundant number, since it is smaller than the sum of its proper divisors (3125068339464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645445452536 is a wasteful number, since it uses less digits than its factorization.

1645445452536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76890 (or 76880 counting only the distinct ones).

The product of its digits is 34560000, while the sum is 54.

The spelling of 1645445452536 in words is "one trillion, six hundred forty-five billion, four hundred forty-five million, four hundred fifty-two thousand, five hundred thirty-six".