65699989971 has 64 divisors (see below), whose sum is σ = 115842355200. Its totient is φ = 32086454400.

The previous prime is 65699989961. The next prime is 65699990003. The reversal of 65699989971 is 17998999656.

It is not a de Polignac number, because 65699989971 - 2¹¹ = 65699987923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65699989931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 517825 + ... + 632093.

It is an arithmetic number, because the mean of its divisors is an integer number (1810036800).

Almost surely, 2^65699989971 is an apocalyptic number.

65699989971 is a deficient number, since it is larger than the sum of its proper divisors (50142365229).

65699989971 is a wasteful number, since it uses less digits than its factorization.

65699989971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114440.

The product of its digits is 595213920, while the sum is 78.

The spelling of 65699989971 in words is "sixty-five billion, six hundred ninety-nine million, nine hundred eighty-nine thousand, nine hundred seventy-one".