7641921633817 has 4 divisors (see below), whose sum is σ = 7644719850256. Its totient is φ = 7639123417380.

The previous prime is 7641921633803. The next prime is 7641921633823. The reversal of 7641921633817 is 7183361291467.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7641921633817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7641921633887) 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, 1399104123 + ... + 1399109584.

It is an arithmetic number, because the mean of its divisors is an integer number (1911179962564).

Almost surely, 2^{7641921633817} is an apocalyptic number.

It is an amenable number.

7641921633817 is a deficient number, since it is larger than the sum of its proper divisors (2798216439).

7641921633817 is a wasteful number, since it uses less digits than its factorization.

7641921633817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2798216438.

The product of its digits is 9144576, while the sum is 58.

The spelling of 7641921633817 in words is "seven trillion, six hundred forty-one billion, nine hundred twenty-one million, six hundred thirty-three thousand, eight hundred seventeen".