55777219901 has 8 divisors (see below), whose sum is σ = 60073367424. Its totient is φ = 51481871280.

The previous prime is 55777219853. The next prime is 55777219909. The reversal of 55777219901 is 10991277755.

It is a happy number.

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 55777219901 - 2⁶ = 55777219837 is a prime.

It is a super-2 number, since 2×55777219901² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55777219909) 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, 50585 + ... + 337806.

It is an arithmetic number, because the mean of its divisors is an integer number (7509170928).

Almost surely, 2^55777219901 is an apocalyptic number.

It is an amenable number.

55777219901 is a deficient number, since it is larger than the sum of its proper divisors (4296147523).

55777219901 is a wasteful number, since it uses less digits than its factorization.

55777219901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399451.

The product of its (nonzero) digits is 1389150, while the sum is 53.

The spelling of 55777219901 in words is "fifty-five billion, seven hundred seventy-seven million, two hundred nineteen thousand, nine hundred one".