55776691 has 4 divisors (see below), whose sum is σ = 55792800. Its totient is φ = 55760584.

The previous prime is 55776689. The next prime is 55776701. The reversal of 55776691 is 19667755.

It is a happy number.

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 55776691 - 2¹ = 55776689 is a prime.

It is a super-2 number, since 2×55776691² = 6222078517818962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55776601) 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, 496 + ... + 10573.

It is an arithmetic number, because the mean of its divisors is an integer number (13948200).

Almost surely, 2^55776691 is an apocalyptic number.

55776691 is a deficient number, since it is larger than the sum of its proper divisors (16109).

55776691 is a wasteful number, since it uses less digits than its factorization.

55776691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16108.

The product of its digits is 396900, while the sum is 46.

The square root of 55776691 is about 7468.3794092159. The cubic root of 55776691 is about 382.0770177211.

The spelling of 55776691 in words is "fifty-five million, seven hundred seventy-six thousand, six hundred ninety-one".