55278107807551 has 4 divisors (see below), whose sum is σ = 55785246411400. Its totient is φ = 54770969203704.

The previous prime is 55278107807501. The next prime is 55278107807557. The reversal of 55278107807551 is 15570870187255.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55278107807551 - 2⁷ = 55278107807423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55278107807551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55278107807557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253569301761 + ... + 253569301978.

It is an arithmetic number, because the mean of its divisors is an integer number (13946311602850).

Almost surely, 2^{55278107807551} is an apocalyptic number.

55278107807551 is a deficient number, since it is larger than the sum of its proper divisors (507138603849).

55278107807551 is a wasteful number, since it uses less digits than its factorization.

55278107807551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507138603848.

The product of its (nonzero) digits is 27440000, while the sum is 61.

The spelling of 55278107807551 in words is "fifty-five trillion, two hundred seventy-eight billion, one hundred seven million, eight hundred seven thousand, five hundred fifty-one".