55278277565 has 16 divisors (see below), whose sum is σ = 75817665792. Its totient is φ = 37901376384.

The previous prime is 55278277553. The next prime is 55278277583. The reversal of 55278277565 is 56577287255.

It is a cyclic number.

It is not a de Polignac number, because 55278277565 - 2²² = 55274083261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310592 + ... + 454998.

It is an arithmetic number, because the mean of its divisors is an integer number (4738604112).

Almost surely, 2^55278277565 is an apocalyptic number.

It is an amenable number.

55278277565 is a deficient number, since it is larger than the sum of its proper divisors (20539388227).

55278277565 is a wasteful number, since it uses less digits than its factorization.

55278277565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155356.

The product of its digits is 41160000, while the sum is 59.

The spelling of 55278277565 in words is "fifty-five billion, two hundred seventy-eight million, two hundred seventy-seven thousand, five hundred sixty-five".