55178288947681 has 9 divisors (see below), whose sum is σ = 56377630664049. Its totient is φ = 54003941102244.

The previous prime is 55178288947679. The next prime is 55178288947687. The reversal of 55178288947681 is 18674988287155.

The square root of 55178288947681 is 7428209.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 55178288947681 - 2¹ = 55178288947679 is a prime.

It is a super-2 number, since 2×55178288947681² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55178288947687) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 349046800 + ... + 349204846.

Almost surely, 2^{55178288947681} is an apocalyptic number.

55178288947681 is the 7428209-th square number.

55178288947681 is the 3714105-th centered octagonal number.

It is an amenable number.

55178288947681 is a deficient number, since it is larger than the sum of its proper divisors (1199341716368).

55178288947681 is an frugal number, since it uses more digits than its factorization.

55178288947681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316188 (or 158094 counting only the distinct ones).

The product of its digits is 2167603200, while the sum is 79.

The spelling of 55178288947681 in words is "fifty-five trillion, one hundred seventy-eight billion, two hundred eighty-eight million, nine hundred forty-seven thousand, six hundred eighty-one".