61308803251 has 2 divisors, whose sum is σ = 61308803252. Its totient is φ = 61308803250.

The previous prime is 61308803239. The next prime is 61308803267. The reversal of 61308803251 is 15230880316.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61308803251 - 2²⁷ = 61174585523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61308803251.

It is not a weakly prime, because it can be changed into another prime (61308803051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30654401625 + 30654401626.

It is an arithmetic number, because the mean of its divisors is an integer number (30654401626).

Almost surely, 2^61308803251 is an apocalyptic number.

61308803251 is a deficient number, since it is larger than the sum of its proper divisors (1).

61308803251 is an equidigital number, since it uses as much as digits as its factorization.

61308803251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 61308803251 in words is "sixty-one billion, three hundred eight million, eight hundred three thousand, two hundred fifty-one".