65994649956 has 144 divisors (see below), whose sum is σ = 177363863040. Its totient is φ = 20653678080.

The previous prime is 65994649933. The next prime is 65994649979.

65994649956 is a `hidden beast` number, since 6 + 5 + 99 + 46 + 499 + 5 + 6 = 666.

65994649956 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (65994649933) and next prime (65994649979).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15647560 + ... + 15651776.

Almost surely, 2^65994649956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65994649956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88681931520).

65994649956 is an abundant number, since it is smaller than the sum of its proper divisors (111369213084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65994649956 is a wasteful number, since it uses less digits than its factorization.

65994649956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4674 (or 4669 counting only the distinct ones).

The product of its digits is 566870400, while the sum is 72.

The spelling of 65994649956 in words is "sixty-five billion, nine hundred ninety-four million, six hundred forty-nine thousand, nine hundred fifty-six".