66040051 has 8 divisors (see below), whose sum is σ = 82335744. Its totient is φ = 51459720.

The previous prime is 66040049. The next prime is 66040097. The reversal of 66040051 is 15004066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66040051 - 2¹ = 66040049 is a prime.

It is a super-2 number, since 2×66040051² = 8722576672165202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66040451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428755 + ... + 428908.

It is an arithmetic number, because the mean of its divisors is an integer number (10291968).

Almost surely, 2^66040051 is an apocalyptic number.

66040051 is a deficient number, since it is larger than the sum of its proper divisors (16295693).

66040051 is a wasteful number, since it uses less digits than its factorization.

66040051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857681.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 66040051 is about 8126.5029994457. The cubic root of 66040051 is about 404.2057308376.

The spelling of 66040051 in words is "sixty-six million, forty thousand, fifty-one".