7748645768161 has 4 divisors (see below), whose sum is σ = 7763869041300. Its totient is φ = 7733422495024.

The previous prime is 7748645768147. The next prime is 7748645768179. The reversal of 7748645768161 is 1618675468477.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2610263528161 + 5138382240000 = 1615631^2 + 2266800^2 .

It is a cyclic number.

It is not a de Polignac number, because 7748645768161 - 2²⁷ = 7748511550433 is a prime.

It is a super-2 number, since 2×7748645768161² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7748645718161) 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, 7611635806 + ... + 7611636823.

It is an arithmetic number, because the mean of its divisors is an integer number (1940967260325).

Almost surely, 2^{7748645768161} is an apocalyptic number.

It is an amenable number.

7748645768161 is a deficient number, since it is larger than the sum of its proper divisors (15223273139).

7748645768161 is a wasteful number, since it uses less digits than its factorization.

7748645768161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15223273138.

The product of its digits is 379330560, while the sum is 70.

The spelling of 7748645768161 in words is "seven trillion, seven hundred forty-eight billion, six hundred forty-five million, seven hundred sixty-eight thousand, one hundred sixty-one".