1620660145 has 24 divisors (see below), whose sum is σ = 2109754296. Its totient is φ = 1194605568.

The previous prime is 1620660143. The next prime is 1620660149. The reversal of 1620660145 is 5410660261.

It can be written as a sum of positive squares in 12 ways, for example, as 448761856 + 1171898289 = 21184^2 + 34233^2 .

It is not a de Polignac number, because 1620660145 - 2¹ = 1620660143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620660143) 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, 570649 + ... + 573481.

It is an arithmetic number, because the mean of its divisors is an integer number (87906429).

Almost surely, 2^1620660145 is an apocalyptic number.

It is an amenable number.

1620660145 is a deficient number, since it is larger than the sum of its proper divisors (489094151).

1620660145 is a wasteful number, since it uses less digits than its factorization.

1620660145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3541 (or 3528 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1620660145 is about 40257.4234769191. The cubic root of 1620660145 is about 1174.6198003344.

The spelling of 1620660145 in words is "one billion, six hundred twenty million, six hundred sixty thousand, one hundred forty-five".