55554999981 has 16 divisors (see below), whose sum is σ = 80864043456. Its totient is φ = 33719366016.

The previous prime is 55554999979. The next prime is 55555000021. The reversal of 55554999981 is 18999945555.

It is not a de Polignac number, because 55554999981 - 2¹ = 55554999979 is a prime.

It is a super-2 number, since 2×55554999981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55554999961) 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, 9753915 + ... + 9759608.

It is an arithmetic number, because the mean of its divisors is an integer number (5054002716).

Almost surely, 2^55554999981 is an apocalyptic number.

It is an amenable number.

55554999981 is a deficient number, since it is larger than the sum of its proper divisors (25309043475).

55554999981 is a wasteful number, since it uses less digits than its factorization.

55554999981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19513612.

The product of its digits is 131220000, while the sum is 69.

The spelling of 55554999981 in words is "fifty-five billion, five hundred fifty-four million, nine hundred ninety-nine thousand, nine hundred eighty-one".