155555535514421 has 32 divisors (see below), whose sum is σ = 182612006105088. Its totient is φ = 129755855845440.

The previous prime is 155555535514409. The next prime is 155555535514441. The reversal of 155555535514421 is 124415535555551.

It is a cyclic number.

It is not a de Polignac number, because 155555535514421 - 2³⁰ = 155554461772597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155555535514441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1303722356 + ... + 1303841666.

It is an arithmetic number, because the mean of its divisors is an integer number (5706625190784).

Almost surely, 2^{155555535514421} is an apocalyptic number.

It is an amenable number.

155555535514421 is a deficient number, since it is larger than the sum of its proper divisors (27056470590667).

155555535514421 is a wasteful number, since it uses less digits than its factorization.

155555535514421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152961.

The product of its digits is 37500000, while the sum is 56.

The spelling of 155555535514421 in words is "one hundred fifty-five trillion, five hundred fifty-five billion, five hundred thirty-five million, five hundred fourteen thousand, four hundred twenty-one".