7774121644 has 6 divisors (see below), whose sum is σ = 13604712884. Its totient is φ = 3887060820.

The previous prime is 7774121633. The next prime is 7774121651. The reversal of 7774121644 is 4461214777.

It is a self number, because there is not a number n which added to its sum of digits gives 7774121644.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 971765202 + ... + 971765209.

Almost surely, 2^7774121644 is an apocalyptic number.

It is an amenable number.

7774121644 is a deficient number, since it is larger than the sum of its proper divisors (5830591240).

7774121644 is a wasteful number, since it uses less digits than its factorization.

7774121644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943530415 (or 1943530413 counting only the distinct ones).

The product of its digits is 263424, while the sum is 43.

The square root of 7774121644 is about 88170.9796021344. The cubic root of 7774121644 is about 1980.9968150178.

The spelling of 7774121644 in words is "seven billion, seven hundred seventy-four million, one hundred twenty-one thousand, six hundred forty-four".