1220543554555 has 16 divisors (see below), whose sum is σ = 1577494989504. Its totient is φ = 901223233920.

The previous prime is 1220543554523. The next prime is 1220543554609. The reversal of 1220543554555 is 5554553450221.

It is not a de Polignac number, because 1220543554555 - 2⁵ = 1220543554523 is a prime.

It is a super-2 number, since 2×1220543554555² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

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, 468919 + ... + 1631248.

It is an arithmetic number, because the mean of its divisors is an integer number (98593436844).

Almost surely, 2^{1220543554555} is an apocalyptic number.

1220543554555 is a deficient number, since it is larger than the sum of its proper divisors (356951434949).

1220543554555 is a wasteful number, since it uses less digits than its factorization.

1220543554555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109126.

The product of its (nonzero) digits is 3000000, while the sum is 46.

The spelling of 1220543554555 in words is "one trillion, two hundred twenty billion, five hundred forty-three million, five hundred fifty-four thousand, five hundred fifty-five".