27790121963 has 4 divisors (see below), whose sum is σ = 27914741568. Its totient is φ = 27665502360.

The previous prime is 27790121959. The next prime is 27790122043. The reversal of 27790121963 is 36912109772.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27790121963 - 2² = 27790121959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27790121903) 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, 62309468 + ... + 62309913.

It is an arithmetic number, because the mean of its divisors is an integer number (6978685392).

Almost surely, 2^27790121963 is an apocalyptic number.

27790121963 is a deficient number, since it is larger than the sum of its proper divisors (124619605).

27790121963 is a wasteful number, since it uses less digits than its factorization.

27790121963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124619604.

The product of its (nonzero) digits is 285768, while the sum is 47.

The spelling of 27790121963 in words is "twenty-seven billion, seven hundred ninety million, one hundred twenty-one thousand, nine hundred sixty-three".