1720148545 has 8 divisors (see below), whose sum is σ = 2072211624. Its totient is φ = 1370763264.

The previous prime is 1720148531. The next prime is 1720148581. The reversal of 1720148545 is 5458410271.

It can be written as a sum of positive squares in 4 ways, for example, as 597362481 + 1122786064 = 24441^2 + 33508^2 .

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-1720148545 is a prime.

It is a super-2 number, since 2×1720148545² = 5917822033731234050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 668034 + ... + 670603.

It is an arithmetic number, because the mean of its divisors is an integer number (259026453).

Almost surely, 2^1720148545 is an apocalyptic number.

It is an amenable number.

1720148545 is a deficient number, since it is larger than the sum of its proper divisors (352063079).

1720148545 is a wasteful number, since it uses less digits than its factorization.

1720148545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338899.

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 1720148545 is about 41474.6735369912. The cubic root of 1720148545 is about 1198.1797739418.

The spelling of 1720148545 in words is "one billion, seven hundred twenty million, one hundred forty-eight thousand, five hundred forty-five".