1645560540 has 72 divisors (see below), whose sum is σ = 5375505408. Its totient is φ = 405060480.

The previous prime is 1645560523. The next prime is 1645560541. The reversal of 1645560540 is 450655461.

1645560540 is a `hidden beast` number, since 1 + 6 + 4 + 5 + 5 + 605 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1645560495 and 1645560504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645560541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 349276 + ... + 353955.

Almost surely, 2^1645560540 is an apocalyptic number.

1645560540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645560540 is an abundant number, since it is smaller than the sum of its proper divisors (3729944868).

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

1645560540 is a wasteful number, since it uses less digits than its factorization.

1645560540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703259 (or 703254 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 1645560540 is about 40565.5092412261. The cubic root of 1645560540 is about 1180.6050090997.

The spelling of 1645560540 in words is "one billion, six hundred forty-five million, five hundred sixty thousand, five hundred forty".