61006128491 has 16 divisors (see below), whose sum is σ = 76196194560. Its totient is φ = 47451864480.

The previous prime is 61006128461. The next prime is 61006128503. The reversal of 61006128491 is 19482160016.

It is a cyclic number.

It is not a de Polignac number, because 61006128491 - 2¹⁰ = 61006127467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61006128401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 668321 + ... + 754098.

It is an arithmetic number, because the mean of its divisors is an integer number (4762262160).

Almost surely, 2^61006128491 is an apocalyptic number.

61006128491 is a deficient number, since it is larger than the sum of its proper divisors (15190066069).

61006128491 is a wasteful number, since it uses less digits than its factorization.

61006128491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422994.

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 61006128491 in words is "sixty-one billion, six million, one hundred twenty-eight thousand, four hundred ninety-one".