5201400661 has 2 divisors, whose sum is σ = 5201400662. Its totient is φ = 5201400660.

The previous prime is 5201400637. The next prime is 5201400667. The reversal of 5201400661 is 1660041025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4665709636 + 535691025 = 68306^2 + 23145^2 .

It is a cyclic number.

It is not a de Polignac number, because 5201400661 - 2²³ = 5193012053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5201400667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2600700330 + 2600700331.

It is an arithmetic number, because the mean of its divisors is an integer number (2600700331).

Almost surely, 2^5201400661 is an apocalyptic number.

It is an amenable number.

5201400661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5201400661 is an equidigital number, since it uses as much as digits as its factorization.

5201400661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 5201400661 is about 72120.7366920222. The cubic root of 5201400661 is about 1732.6337489395.

Adding to 5201400661 its reverse (1660041025), we get a palindrome (6861441686).

The spelling of 5201400661 in words is "five billion, two hundred one million, four hundred thousand, six hundred sixty-one".