7738341621 has 4 divisors (see below), whose sum is σ = 10317788832. Its totient is φ = 5158894412.

The previous prime is 7738341577. The next prime is 7738341733. The reversal of 7738341621 is 1261438377.

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: 1261438377 = 3 ⋅420479459.

It is a cyclic number.

It is not a de Polignac number, because 7738341621 - 2⁶ = 7738341557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7738345621) 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, 1289723601 + ... + 1289723606.

It is an arithmetic number, because the mean of its divisors is an integer number (2579447208).

Almost surely, 2^7738341621 is an apocalyptic number.

It is an amenable number.

7738341621 is a deficient number, since it is larger than the sum of its proper divisors (2579447211).

7738341621 is a wasteful number, since it uses less digits than its factorization.

7738341621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2579447210.

The product of its digits is 169344, while the sum is 42.

The square root of 7738341621 is about 87967.8442443601. The cubic root of 7738341621 is about 1977.9529928547.

Adding to 7738341621 its reverse (1261438377), we get a palindrome (8999779998).

The spelling of 7738341621 in words is "seven billion, seven hundred thirty-eight million, three hundred forty-one thousand, six hundred twenty-one".