55667551 has 4 divisors (see below), whose sum is σ = 55715104. Its totient is φ = 55620000.

The previous prime is 55667531. The next prime is 55667561. The reversal of 55667551 is 15576655.

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 55667551 - 2²¹ = 53570399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55667531) 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, 21975 + ... + 24376.

It is an arithmetic number, because the mean of its divisors is an integer number (13928776).

Almost surely, 2^55667551 is an apocalyptic number.

55667551 is a deficient number, since it is larger than the sum of its proper divisors (47553).

55667551 is a wasteful number, since it uses less digits than its factorization.

55667551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47552.

The product of its digits is 157500, while the sum is 40.

The square root of 55667551 is about 7461.0690252805. The cubic root of 55667551 is about 381.8276476403.

The spelling of 55667551 in words is "fifty-five million, six hundred sixty-seven thousand, five hundred fifty-one".