2145515550 has 48 divisors (see below), whose sum is σ = 5338324992. Its totient is φ = 570261600.

The previous prime is 2145515539. The next prime is 2145515551. The reversal of 2145515550 is 555155412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145515551) 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, 22755 + ... + 69345.

It is an arithmetic number, because the mean of its divisors is an integer number (111215104).

Almost surely, 2^2145515550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2145515550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2669162496).

2145515550 is an abundant number, since it is smaller than the sum of its proper divisors (3192809442).

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

2145515550 is a wasteful number, since it uses less digits than its factorization.

2145515550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46913 (or 46908 counting only the distinct ones).

The product of its (nonzero) digits is 25000, while the sum is 33.

The square root of 2145515550 is about 46319.7101674870. The cubic root of 2145515550 is about 1289.7649051779.

The spelling of 2145515550 in words is "two billion, one hundred forty-five million, five hundred fifteen thousand, five hundred fifty".