53556402778 has 16 divisors (see below), whose sum is σ = 85080511080. Its totient is φ = 25196985856.

The previous prime is 53556402737. The next prime is 53556402811. The reversal of 53556402778 is 87720465535.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 44543368809 + 9013033969 = 211053^2 + 94937^2 .

It is a super-2 number, since 2×53556402778² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42451 + ... + 330022.

Almost surely, 2^53556402778 is an apocalyptic number.

53556402778 is a deficient number, since it is larger than the sum of its proper divisors (31524108302).

53556402778 is a wasteful number, since it uses less digits than its factorization.

53556402778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376721.

The product of its (nonzero) digits is 7056000, while the sum is 52.

The spelling of 53556402778 in words is "fifty-three billion, five hundred fifty-six million, four hundred two thousand, seven hundred seventy-eight".