61254166891 has 2 divisors, whose sum is σ = 61254166892. Its totient is φ = 61254166890.

The previous prime is 61254166871. The next prime is 61254166951. The reversal of 61254166891 is 19866145216.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61254166891 - 2¹³ = 61254158699 is a prime.

It is not a weakly prime, because it can be changed into another prime (61254166871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30627083445 + 30627083446.

It is an arithmetic number, because the mean of its divisors is an integer number (30627083446).

Almost surely, 2^61254166891 is an apocalyptic number.

61254166891 is a deficient number, since it is larger than the sum of its proper divisors (1).

61254166891 is an equidigital number, since it uses as much as digits as its factorization.

61254166891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 49.

The spelling of 61254166891 in words is "sixty-one billion, two hundred fifty-four million, one hundred sixty-six thousand, eight hundred ninety-one".