20616971461 has 2 divisors, whose sum is σ = 20616971462. Its totient is φ = 20616971460.

The previous prime is 20616971423. The next prime is 20616971471. The reversal of 20616971461 is 16417961602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18565425025 + 2051546436 = 136255^2 + 45294^2 .

It is a cyclic number.

It is not a de Polignac number, because 20616971461 - 2¹¹ = 20616969413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20616971471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308485730 + 10308485731.

It is an arithmetic number, because the mean of its divisors is an integer number (10308485731).

Almost surely, 2^20616971461 is an apocalyptic number.

It is an amenable number.

20616971461 is a deficient number, since it is larger than the sum of its proper divisors (1).

20616971461 is an equidigital number, since it uses as much as digits as its factorization.

20616971461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 20616971461 in words is "twenty billion, six hundred sixteen million, nine hundred seventy-one thousand, four hundred sixty-one".