1645551530749 has 24 divisors (see below), whose sum is σ = 1994136883200. Its totient is φ = 1352747632320.

The previous prime is 1645551530747. The next prime is 1645551530771. The reversal of 1645551530749 is 9470351555461.

It is not a de Polignac number, because 1645551530749 - 2¹ = 1645551530747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645551530749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645551530747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6822909 + ... + 7059970.

It is an arithmetic number, because the mean of its divisors is an integer number (83089036800).

Almost surely, 2^{1645551530749} is an apocalyptic number.

It is an amenable number.

1645551530749 is a deficient number, since it is larger than the sum of its proper divisors (348585352451).

1645551530749 is a wasteful number, since it uses less digits than its factorization.

1645551530749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13882993 (or 13882986 counting only the distinct ones).

The product of its (nonzero) digits is 11340000, while the sum is 55.

The spelling of 1645551530749 in words is "one trillion, six hundred forty-five billion, five hundred fifty-one million, five hundred thirty thousand, seven hundred forty-nine".