55781130329 has 16 divisors (see below), whose sum is σ = 58305582720. Its totient is φ = 53316144000.

The previous prime is 55781130311. The next prime is 55781130341. The reversal of 55781130329 is 92303118755.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55781130329 is a prime.

It is a super-2 number, since 2×55781130329² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55781130329.

It is not an unprimeable number, because it can be changed into a prime (55781160329) 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, 636812 + ... + 719090.

It is an arithmetic number, because the mean of its divisors is an integer number (3644098920).

Almost surely, 2^55781130329 is an apocalyptic number.

It is an amenable number.

55781130329 is a deficient number, since it is larger than the sum of its proper divisors (2524452391).

55781130329 is a wasteful number, since it uses less digits than its factorization.

55781130329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82640.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 55781130329 in words is "fifty-five billion, seven hundred eighty-one million, one hundred thirty thousand, three hundred twenty-nine".