1220500041545 has 4 divisors (see below), whose sum is σ = 1464600049860. Its totient is φ = 976400033232.

The previous prime is 1220500041521. The next prime is 1220500041559. The reversal of 1220500041545 is 5451400050221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 750962629561 + 469537411984 = 866581^2 + 685228^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220500041545 - 2⁸ = 1220500041289 is a prime.

It is a super-2 number, since 2×1220500041545² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122050004150 + ... + 122050004159.

It is an arithmetic number, because the mean of its divisors is an integer number (366150012465).

Almost surely, 2^{1220500041545} is an apocalyptic number.

It is an amenable number.

1220500041545 is a deficient number, since it is larger than the sum of its proper divisors (244100008315).

1220500041545 is an equidigital number, since it uses as much as digits as its factorization.

1220500041545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244100008314.

The product of its (nonzero) digits is 8000, while the sum is 29.

Adding to 1220500041545 its reverse (5451400050221), we get a palindrome (6671900091766).

The spelling of 1220500041545 in words is "one trillion, two hundred twenty billion, five hundred million, forty-one thousand, five hundred forty-five".