1220520550545 has 48 divisors (see below), whose sum is σ = 2226668633280. Its totient is φ = 641228664384.

The previous prime is 1220520550531. The next prime is 1220520550567. The reversal of 1220520550545 is 5450550250221.

1220520550545 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 52 + 0 + 550 + 54 + 5 = 666.

It is not a de Polignac number, because 1220520550545 - 2⁶ = 1220520550481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7415190 + ... + 7577999.

It is an arithmetic number, because the mean of its divisors is an integer number (46388929860).

Almost surely, 2^{1220520550545} is an apocalyptic number.

1220520550545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220520550545 is a deficient number, since it is larger than the sum of its proper divisors (1006148082735).

1220520550545 is an equidigital number, since it uses as much as digits as its factorization.

1220520550545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14993276 (or 14993264 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 36.

The spelling of 1220520550545 in words is "one trillion, two hundred twenty billion, five hundred twenty million, five hundred fifty thousand, five hundred forty-five".