6650615401 has 2 divisors, whose sum is σ = 6650615402. Its totient is φ = 6650615400.

The previous prime is 6650615359. The next prime is 6650615423. The reversal of 6650615401 is 1045160566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6265514025 + 385101376 = 79155^2 + 19624^2 .

It is a cyclic number.

It is not a de Polignac number, because 6650615401 - 2⁹ = 6650614889 is a prime.

It is not a weakly prime, because it can be changed into another prime (6650610401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325307700 + 3325307701.

It is an arithmetic number, because the mean of its divisors is an integer number (3325307701).

Almost surely, 2^6650615401 is an apocalyptic number.

It is an amenable number.

6650615401 is a deficient number, since it is larger than the sum of its proper divisors (1).

6650615401 is an equidigital number, since it uses as much as digits as its factorization.

6650615401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 6650615401 is about 81551.3053298352. The cubic root of 6650615401 is about 1880.5603619504.

Adding to 6650615401 its reverse (1045160566), we get a palindrome (7695775967).

The spelling of 6650615401 in words is "six billion, six hundred fifty million, six hundred fifteen thousand, four hundred one".