2545161220 has 48 divisors (see below), whose sum is σ = 6319031040. Its totient is φ = 842534784.

The previous prime is 2545161173. The next prime is 2545161251. The reversal of 2545161220 is 221615452.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 309384 + ... + 317503.

It is an arithmetic number, because the mean of its divisors is an integer number (131646480).

Almost surely, 2^2545161220 is an apocalyptic number.

2545161220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2545161220 is an abundant number, since it is smaller than the sum of its proper divisors (3773869820).

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

2545161220 is a wasteful number, since it uses less digits than its factorization.

2545161220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626932 (or 626930 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 2545161220 is about 50449.5908804026. The cubic root of 2545161220 is about 1365.3325134643.

Adding to 2545161220 its reverse (221615452), we get a palindrome (2766776672).

The spelling of 2545161220 in words is "two billion, five hundred forty-five million, one hundred sixty-one thousand, two hundred twenty".