7766650621 has 4 divisors (see below), whose sum is σ = 7785187200. Its totient is φ = 7748114044.

The previous prime is 7766650613. The next prime is 7766650637. The reversal of 7766650621 is 1260566677.

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: 1260566677 = 17 ⋅74150981.

It is a cyclic number.

It is not a de Polignac number, because 7766650621 - 2³ = 7766650613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7766650321) 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, 9267661 + ... + 9268498.

It is an arithmetic number, because the mean of its divisors is an integer number (1946296800).

Almost surely, 2^7766650621 is an apocalyptic number.

It is an amenable number.

7766650621 is a deficient number, since it is larger than the sum of its proper divisors (18536579).

7766650621 is a wasteful number, since it uses less digits than its factorization.

7766650621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18536578.

The product of its (nonzero) digits is 635040, while the sum is 46.

The square root of 7766650621 is about 88128.6027405405. The cubic root of 7766650621 is about 1980.3620244912.

The spelling of 7766650621 in words is "seven billion, seven hundred sixty-six million, six hundred fifty thousand, six hundred twenty-one".