7961218745 has 32 divisors (see below), whose sum is σ = 10228498560. Its totient is φ = 5927685120.

The previous prime is 7961218723. The next prime is 7961218777. The reversal of 7961218745 is 5478121697.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-7961218745 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7961218693 and 7961218702.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3342455 + ... + 3344835.

It is an arithmetic number, because the mean of its divisors is an integer number (319640580).

Almost surely, 2^7961218745 is an apocalyptic number.

It is an amenable number.

7961218745 is a deficient number, since it is larger than the sum of its proper divisors (2267279815).

7961218745 is a wasteful number, since it uses less digits than its factorization.

7961218745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825.

The product of its digits is 846720, while the sum is 50.

The square root of 7961218745 is about 89225.6619196518. The cubic root of 7961218745 is about 1996.7629924676.

The spelling of 7961218745 in words is "seven billion, nine hundred sixty-one million, two hundred eighteen thousand, seven hundred forty-five".