2145521616 has 80 divisors (see below), whose sum is σ = 6552854400. Its totient is φ = 591865344.

The previous prime is 2145521603. The next prime is 2145521647. The reversal of 2145521616 is 6161255412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100351 + ... + 119838.

It is an arithmetic number, because the mean of its divisors is an integer number (81910680).

Almost surely, 2^2145521616 is an apocalyptic number.

It is an amenable number.

2145521616 is an abundant number, since it is smaller than the sum of its proper divisors (4407332784).

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

2145521616 is a wasteful number, since it uses less digits than its factorization.

2145521616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220236 (or 220230 counting only the distinct ones).

The product of its digits is 14400, while the sum is 33.

The square root of 2145521616 is about 46319.7756471251. The cubic root of 2145521616 is about 1289.7661206910.

It can be divided in two parts, 21455 and 21616, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 2145521616 in words is "two billion, one hundred forty-five million, five hundred twenty-one thousand, six hundred sixteen".