61016216251 has 2 divisors, whose sum is σ = 61016216252. Its totient is φ = 61016216250.

The previous prime is 61016216237. The next prime is 61016216293. The reversal of 61016216251 is 15261261016.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61016216251 - 2⁷ = 61016216123 is a prime.

It is not a weakly prime, because it can be changed into another prime (61016216221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30508108125 + 30508108126.

It is an arithmetic number, because the mean of its divisors is an integer number (30508108126).

Almost surely, 2^61016216251 is an apocalyptic number.

61016216251 is a deficient number, since it is larger than the sum of its proper divisors (1).

61016216251 is an equidigital number, since it uses as much as digits as its factorization.

61016216251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 61016216251 its reverse (15261261016), we get a palindrome (76277477267).

The spelling of 61016216251 in words is "sixty-one billion, sixteen million, two hundred sixteen thousand, two hundred fifty-one".