66554761 has 16 divisors (see below), whose sum is σ = 83075328. Its totient is φ = 51912000.

The previous prime is 66554759. The next prime is 66554771. The reversal of 66554761 is 16745566.

It is not a de Polignac number, because 66554761 - 2¹ = 66554759 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66554771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1311 + ... + 11611.

It is an arithmetic number, because the mean of its divisors is an integer number (5192208).

Almost surely, 2^66554761 is an apocalyptic number.

It is an amenable number.

66554761 is a deficient number, since it is larger than the sum of its proper divisors (16520567).

66554761 is a wasteful number, since it uses less digits than its factorization.

66554761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10392.

The product of its digits is 151200, while the sum is 40.

The square root of 66554761 is about 8158.1101365451. The cubic root of 66554761 is about 405.2531283522.

The spelling of 66554761 in words is "sixty-six million, five hundred fifty-four thousand, seven hundred sixty-one".