66551051 has 4 divisors (see below), whose sum is σ = 76058352. Its totient is φ = 57043752.

The previous prime is 66551047. The next prime is 66551063. The reversal of 66551051 is 15015566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15015566 = 2 ⋅7507783.

It is a cyclic number.

It is not a de Polignac number, because 66551051 - 2² = 66551047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66551041) 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, 4753640 + ... + 4753653.

It is an arithmetic number, because the mean of its divisors is an integer number (19014588).

Almost surely, 2^66551051 is an apocalyptic number.

66551051 is a deficient number, since it is larger than the sum of its proper divisors (9507301).

66551051 is an equidigital number, since it uses as much as digits as its factorization.

66551051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9507300.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 66551051 is about 8157.8827522832. The cubic root of 66551051 is about 405.2455981269.

The spelling of 66551051 in words is "sixty-six million, five hundred fifty-one thousand, fifty-one".