55778449507 has 8 divisors (see below), whose sum is σ = 60851527920. Its totient is φ = 50705756160.

The previous prime is 55778449501. The next prime is 55778449541. The reversal of 55778449507 is 70594487755.

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

It is a cyclic number.

It is not a de Polignac number, because 55778449507 - 2¹⁹ = 55777925219 is a prime.

It is a super-2 number, since 2×55778449507² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55778449501) 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, 265863 + ... + 426895.

It is an arithmetic number, because the mean of its divisors is an integer number (7606440990).

Almost surely, 2^55778449507 is an apocalyptic number.

55778449507 is a deficient number, since it is larger than the sum of its proper divisors (5073078413).

55778449507 is a wasteful number, since it uses less digits than its factorization.

55778449507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192533.

The product of its (nonzero) digits is 49392000, while the sum is 61.

The spelling of 55778449507 in words is "fifty-five billion, seven hundred seventy-eight million, four hundred forty-nine thousand, five hundred seven".