91967840644 has 9 divisors (see below), whose sum is σ = 160944782551. Its totient is φ = 45983617060.

The previous prime is 91967840633. The next prime is 91967840651. The reversal of 91967840644 is 44604876919.

The square root of 91967840644 is 303262.

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

It is a super-3 number, since 3×91967840644³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 530709 + ... + 682339.

Almost surely, 2^91967840644 is an apocalyptic number.

91967840644 is the 303262-nd square number.

It is an amenable number.

91967840644 is a deficient number, since it is larger than the sum of its proper divisors (68976941907).

91967840644 is an frugal number, since it uses more digits than its factorization.

91967840644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303266 (or 151633 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 58.

The spelling of 91967840644 in words is "ninety-one billion, nine hundred sixty-seven million, eight hundred forty thousand, six hundred forty-four".