20761967461 has 2 divisors, whose sum is σ = 20761967462. Its totient is φ = 20761967460.

The previous prime is 20761967441. The next prime is 20761967507. The reversal of 20761967461 is 16476916702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20042064900 + 719902561 = 141570^2 + 26831^2 .

It is a cyclic number.

It is not a de Polignac number, because 20761967461 - 2¹⁵ = 20761934693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20761967441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10380983730 + 10380983731.

It is an arithmetic number, because the mean of its divisors is an integer number (10380983731).

Almost surely, 2^20761967461 is an apocalyptic number.

It is an amenable number.

20761967461 is a deficient number, since it is larger than the sum of its proper divisors (1).

20761967461 is an equidigital number, since it uses as much as digits as its factorization.

20761967461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 49.

The spelling of 20761967461 in words is "twenty billion, seven hundred sixty-one million, nine hundred sixty-seven thousand, four hundred sixty-one".