66145839 has 8 divisors (see below), whose sum is σ = 91235760. Its totient is φ = 42576576.

The previous prime is 66145829. The next prime is 66145841. The reversal of 66145839 is 93854166.

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

It is not a de Polignac number, because 66145839 - 2⁷ = 66145711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66145839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66145829) 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, 380062 + ... + 380235.

It is an arithmetic number, because the mean of its divisors is an integer number (11404470).

Almost surely, 2^66145839 is an apocalyptic number.

66145839 is a deficient number, since it is larger than the sum of its proper divisors (25089921).

66145839 is a wasteful number, since it uses less digits than its factorization.

66145839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760329.

The product of its digits is 155520, while the sum is 42.

The square root of 66145839 is about 8133.0092216842. The cubic root of 66145839 is about 404.4214449049.

The spelling of 66145839 in words is "sixty-six million, one hundred forty-five thousand, eight hundred thirty-nine".