7963897681 has 4 divisors (see below), whose sum is σ = 7986081600. Its totient is φ = 7941713764.

The previous prime is 7963897663. The next prime is 7963897699. The reversal of 7963897681 is 1867983697.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1867983697 = 4021 ⋅464557.

It is an interprime number because it is at equal distance from previous prime (7963897663) and next prime (7963897699).

It is a cyclic number.

It is not a de Polignac number, because 7963897681 - 2¹³ = 7963889489 is a prime.

It is a super-2 number, since 2×7963897681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7963897631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11091421 + ... + 11092138.

It is an arithmetic number, because the mean of its divisors is an integer number (1996520400).

Almost surely, 2^7963897681 is an apocalyptic number.

It is an amenable number.

7963897681 is a deficient number, since it is larger than the sum of its proper divisors (22183919).

7963897681 is a wasteful number, since it uses less digits than its factorization.

7963897681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22183918.

The product of its digits is 27433728, while the sum is 64.

The square root of 7963897681 is about 89240.6727955365. The cubic root of 7963897681 is about 1996.9869364201.

The spelling of 7963897681 in words is "seven billion, nine hundred sixty-three million, eight hundred ninety-seven thousand, six hundred eighty-one".