1220025345 has 64 divisors (see below), whose sum is σ = 2440488960. Its totient is φ = 505612800.

The previous prime is 1220025343. The next prime is 1220025353. The reversal of 1220025345 is 5435200221.

It is not a de Polignac number, because 1220025345 - 2¹ = 1220025343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220025341) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 482685 + ... + 485205.

It is an arithmetic number, because the mean of its divisors is an integer number (38132640).

Almost surely, 2^1220025345 is an apocalyptic number.

1220025345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220025345 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

1220025345 is a wasteful number, since it uses less digits than its factorization.

1220025345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2966.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 1220025345 is about 34928.8612038812. The cubic root of 1220025345 is about 1068.5371295200.

Adding to 1220025345 its reverse (5435200221), we get a palindrome (6655225566).

The spelling of 1220025345 in words is "one billion, two hundred twenty million, twenty-five thousand, three hundred forty-five".