66540351 has 16 divisors (see below), whose sum is σ = 90091008. Its totient is φ = 43680000.

The previous prime is 66540347. The next prime is 66540367. The reversal of 66540351 is 15304566.

It is not a de Polignac number, because 66540351 - 2² = 66540347 is a prime.

It is a super-2 number, since 2×66540351² = 8855236622406402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66540151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72586 + ... + 73496.

It is an arithmetic number, because the mean of its divisors is an integer number (5630688).

Almost surely, 2^66540351 is an apocalyptic number.

66540351 is a deficient number, since it is larger than the sum of its proper divisors (23550657).

66540351 is a wasteful number, since it uses less digits than its factorization.

66540351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 66540351 is about 8157.2269185061. The cubic root of 66540351 is about 405.2238786587.

The spelling of 66540351 in words is "sixty-six million, five hundred forty thousand, three hundred fifty-one".