65660987536 has 75 divisors (see below), whose sum is σ = 134620532761. Its totient is φ = 31023973568.

The previous prime is 65660987519. The next prime is 65660987549. The reversal of 65660987536 is 63578906656.

It is a happy number.

The square root of 65660987536 is 256244.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 34431029136 + 31229958400 = 185556^2 + 176720^2 .

It is a super-2 number, since 2×65660987536² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1397042265 + ... + 1397042311.

Almost surely, 2^65660987536 is an apocalyptic number.

65660987536 is the 256244-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65660987536

65660987536 is an abundant number, since it is smaller than the sum of its proper divisors (68959545225).

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

65660987536 is an frugal number, since it uses more digits than its factorization.

65660987536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 48988800, while the sum is 61.

The spelling of 65660987536 in words is "sixty-five billion, six hundred sixty million, nine hundred eighty-seven thousand, five hundred thirty-six".