775127261421 has 6 divisors (see below), whose sum is σ = 1119628266510. Its totient is φ = 516751507608.

The previous prime is 775127261413. The next prime is 775127261501. The reversal of 775127261421 is 124162721577.

It is a happy number.

775127261421 is a `hidden beast` number, since 7 + 7 + 5 + 1 + 2 + 7 + 2 + 614 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 674550116100 + 100577145321 = 821310^2 + 317139^2 .

It is not a de Polignac number, because 775127261421 - 2³ = 775127261413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775127251421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43062625626 + ... + 43062625643.

It is an arithmetic number, because the mean of its divisors is an integer number (186604711085).

Almost surely, 2^775127261421 is an apocalyptic number.

It is an amenable number.

775127261421 is a deficient number, since it is larger than the sum of its proper divisors (344501005089).

775127261421 is a wasteful number, since it uses less digits than its factorization.

775127261421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86125251275 (or 86125251272 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

Adding to 775127261421 its reverse (124162721577), we get a palindrome (899289982998).

The spelling of 775127261421 in words is "seven hundred seventy-five billion, one hundred twenty-seven million, two hundred sixty-one thousand, four hundred twenty-one".