55506001555 has 16 divisors (see below), whose sum is σ = 70565693184. Its totient is φ = 41768801280.

The previous prime is 55506001553. The next prime is 55506001561. The reversal of 55506001555 is 55510060555.

It is not a de Polignac number, because 55506001555 - 2¹ = 55506001553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55506001553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37251 + ... + 335260.

It is an arithmetic number, because the mean of its divisors is an integer number (4410355824).

Almost surely, 2^55506001555 is an apocalyptic number.

55506001555 is the 149005-th heptagonal number.

55506001555 is a deficient number, since it is larger than the sum of its proper divisors (15059691629).

55506001555 is a wasteful number, since it uses less digits than its factorization.

55506001555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374286.

The product of its (nonzero) digits is 93750, while the sum is 37.

The spelling of 55506001555 in words is "fifty-five billion, five hundred six million, one thousand, five hundred fifty-five".