6616501501 has 2 divisors, whose sum is σ = 6616501502. Its totient is φ = 6616501500.

The previous prime is 6616501481. The next prime is 6616501519. The reversal of 6616501501 is 1051056166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5936856601 + 679644900 = 77051^2 + 26070^2 .

It is a cyclic number.

It is not a de Polignac number, because 6616501501 - 2⁷ = 6616501373 is a prime.

It is a super-2 number, since 2×6616501501² = 87556184225470506002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6616501531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3308250750 + 3308250751.

It is an arithmetic number, because the mean of its divisors is an integer number (3308250751).

Almost surely, 2^6616501501 is an apocalyptic number.

It is an amenable number.

6616501501 is a deficient number, since it is larger than the sum of its proper divisors (1).

6616501501 is an equidigital number, since it uses as much as digits as its factorization.

6616501501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 6616501501 is about 81341.8803630700. The cubic root of 6616501501 is about 1877.3394443919.

Adding to 6616501501 its reverse (1051056166), we get a palindrome (7667557667).

The spelling of 6616501501 in words is "six billion, six hundred sixteen million, five hundred one thousand, five hundred one".