55774428642 has 12 divisors (see below), whose sum is σ = 120844595430. Its totient is φ = 18591476208.

The previous prime is 55774428613. The next prime is 55774428649. The reversal of 55774428642 is 24682447755.

55774428642 is a `hidden beast` number, since 5 + 577 + 4 + 4 + 2 + 8 + 64 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 55648338201 + 126090441 = 235899^2 + 11229^2 .

It is a super-2 number, since 2×55774428642² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55774428649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1549289667 + ... + 1549289702.

Almost surely, 2^55774428642 is an apocalyptic number.

55774428642 is an abundant number, since it is smaller than the sum of its proper divisors (65070166788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55774428642 is a wasteful number, since it uses less digits than its factorization.

55774428642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3098579377 (or 3098579374 counting only the distinct ones).

The product of its digits is 15052800, while the sum is 54.

It can be divided in two parts, 55774 and 428642, that added together give a square (484416 = 696²).

The spelling of 55774428642 in words is "fifty-five billion, seven hundred seventy-four million, four hundred twenty-eight thousand, six hundred forty-two".