55151766 has 44 divisors (see below), whose sum is σ = 124356492. Its totient is φ = 18344556.

The previous prime is 55151753. The next prime is 55151771. The reversal of 55151766 is 66715155.

It is a self number, because there is not a number n which added to its sum of digits gives 55151766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 21 ways as a sum of consecutive naturals, for example, 117865 + ... + 118331.

Almost surely, 2^55151766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55151766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62178246).

55151766 is an abundant number, since it is smaller than the sum of its proper divisors (69204726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55151766 is an frugal number, since it uses more digits than its factorization.

55151766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 472 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 55151766 is about 7426.4234999090. The cubic root of 55151766 is about 380.6447180933.

The spelling of 55151766 in words is "fifty-five million, one hundred fifty-one thousand, seven hundred sixty-six".