1520006645 has 4 divisors (see below), whose sum is σ = 1824007980. Its totient is φ = 1216005312.

The previous prime is 1520006641. The next prime is 1520006713. The reversal of 1520006645 is 5466000251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5466000251 = 317 ⋅17242903.

It can be written as a sum of positive squares in 2 ways, for example, as 1154776324 + 365230321 = 33982^2 + 19111^2 .

It is a cyclic number.

It is not a de Polignac number, because 1520006645 - 2² = 1520006641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520006641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152000660 + ... + 152000669.

It is an arithmetic number, because the mean of its divisors is an integer number (456001995).

Almost surely, 2^1520006645 is an apocalyptic number.

It is an amenable number.

1520006645 is a deficient number, since it is larger than the sum of its proper divisors (304001335).

1520006645 is an equidigital number, since it uses as much as digits as its factorization.

1520006645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304001334.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1520006645 is about 38987.2625994696. The cubic root of 1520006645 is about 1149.7810912874.

Adding to 1520006645 its reverse (5466000251), we get a palindrome (6986006896).

The spelling of 1520006645 in words is "one billion, five hundred twenty million, six thousand, six hundred forty-five".