7669777421 has 4 divisors (see below), whose sum is σ = 7696879392. Its totient is φ = 7642675452.

The previous prime is 7669777417. The next prime is 7669777429. The reversal of 7669777421 is 1247779667.

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: 1247779667 = 31 ⋅40250957.

It is a cyclic number.

It is not a de Polignac number, because 7669777421 - 2² = 7669777417 is a prime.

It is a super-2 number, since 2×7669777421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7669777429) 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, 13550561 + ... + 13551126.

It is an arithmetic number, because the mean of its divisors is an integer number (1924219848).

Almost surely, 2^7669777421 is an apocalyptic number.

It is an amenable number.

7669777421 is a deficient number, since it is larger than the sum of its proper divisors (27101971).

7669777421 is a wasteful number, since it uses less digits than its factorization.

7669777421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27101970.

The product of its digits is 6223392, while the sum is 56.

The square root of 7669777421 is about 87577.2654345864. The cubic root of 7669777421 is about 1972.0938871766.

The spelling of 7669777421 in words is "seven billion, six hundred sixty-nine million, seven hundred seventy-seven thousand, four hundred twenty-one".