20373699761 has 2 divisors, whose sum is σ = 20373699762. Its totient is φ = 20373699760.

The previous prime is 20373699733. The next prime is 20373699781. The reversal of 20373699761 is 16799637302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19847456161 + 526243600 = 140881^2 + 22940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20373699761 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20373699781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10186849880 + 10186849881.

It is an arithmetic number, because the mean of its divisors is an integer number (10186849881).

Almost surely, 2^20373699761 is an apocalyptic number.

It is an amenable number.

20373699761 is a deficient number, since it is larger than the sum of its proper divisors (1).

20373699761 is an equidigital number, since it uses as much as digits as its factorization.

20373699761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2571912, while the sum is 53.

The spelling of 20373699761 in words is "twenty billion, three hundred seventy-three million, six hundred ninety-nine thousand, seven hundred sixty-one".