61043615251 has 2 divisors, whose sum is σ = 61043615252. Its totient is φ = 61043615250.

The previous prime is 61043615219. The next prime is 61043615287. The reversal of 61043615251 is 15251634016.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61043615251 - 2⁵ = 61043615219 is a prime.

It is not a weakly prime, because it can be changed into another prime (61043615201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30521807625 + 30521807626.

It is an arithmetic number, because the mean of its divisors is an integer number (30521807626).

Almost surely, 2^61043615251 is an apocalyptic number.

61043615251 is a deficient number, since it is larger than the sum of its proper divisors (1).

61043615251 is an equidigital number, since it uses as much as digits as its factorization.

61043615251 is an evil number, because the sum of its binary digits is even.

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

The spelling of 61043615251 in words is "sixty-one billion, forty-three million, six hundred fifteen thousand, two hundred fifty-one".