64999143 has 36 divisors (see below), whose sum is σ = 109300464. Its totient is φ = 37065600.

The previous prime is 64999141. The next prime is 64999159. The reversal of 64999143 is 34199946.

It is not a de Polignac number, because 64999143 - 2¹ = 64999141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64999141) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16758 + ... + 20268.

It is an arithmetic number, because the mean of its divisors is an integer number (3036124).

Almost surely, 2^64999143 is an apocalyptic number.

64999143 is a deficient number, since it is larger than the sum of its proper divisors (44301321).

64999143 is a wasteful number, since it uses less digits than its factorization.

64999143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556 (or 3542 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 64999143 is about 8062.2045992396. The cubic root of 64999143 is about 402.0708087937.

The spelling of 64999143 in words is "sixty-four million, nine hundred ninety-nine thousand, one hundred forty-three".