20777610481 has 2 divisors, whose sum is σ = 20777610482. Its totient is φ = 20777610480.

The previous prime is 20777610437. The next prime is 20777610521. The reversal of 20777610481 is 18401677702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15648759025 + 5128851456 = 125095^2 + 71616^2 .

It is a cyclic number.

It is not a de Polignac number, because 20777610481 - 2⁷ = 20777610353 is a prime.

It is a super-2 number, since 2×20777610481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20777610421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10388805240 + 10388805241.

It is an arithmetic number, because the mean of its divisors is an integer number (10388805241).

Almost surely, 2^20777610481 is an apocalyptic number.

It is an amenable number.

20777610481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20777610481 is an equidigital number, since it uses as much as digits as its factorization.

20777610481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131712, while the sum is 43.

The spelling of 20777610481 in words is "twenty billion, seven hundred seventy-seven million, six hundred ten thousand, four hundred eighty-one".