55405719681 has 8 divisors (see below), whose sum is σ = 79556930880. Its totient is φ = 34095827472.

The previous prime is 55405719647. The next prime is 55405719701. The reversal of 55405719681 is 18691750455.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55405719681 - 2⁹ = 55405719169 is a prime.

It is a super-2 number, since 2×55405719681² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55405719631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710329701 + ... + 710329778.

It is an arithmetic number, because the mean of its divisors is an integer number (9944616360).

Almost surely, 2^55405719681 is an apocalyptic number.

It is an amenable number.

55405719681 is a deficient number, since it is larger than the sum of its proper divisors (24151211199).

55405719681 is a wasteful number, since it uses less digits than its factorization.

55405719681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420659495.

The product of its (nonzero) digits is 1512000, while the sum is 51.

The spelling of 55405719681 in words is "fifty-five billion, four hundred five million, seven hundred nineteen thousand, six hundred eighty-one".