65661034624 has 16 divisors (see below), whose sum is σ = 130809092670. Its totient is φ = 32830517248.

The previous prime is 65661034601. The next prime is 65661034631. The reversal of 65661034624 is 42643016656.

It can be written as a sum of positive squares in only one way, i.e., 62040846400 + 3620188224 = 249080^2 + 60168^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-3 number, since 3×65661034624³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256488289 + ... + 256488544.

Almost surely, 2^65661034624 is an apocalyptic number.

65661034624 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

65661034624 is a deficient number, since it is larger than the sum of its proper divisors (65148058046).

65661034624 is an equidigital number, since it uses as much as digits as its factorization.

65661034624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512976847 (or 512976835 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 43.

The spelling of 65661034624 in words is "sixty-five billion, six hundred sixty-one million, thirty-four thousand, six hundred twenty-four".