61454920858 has 36 divisors (see below), whose sum is σ = 97759498590. Its totient is φ = 28939661856.

The previous prime is 61454920853. The next prime is 61454920867. The reversal of 61454920858 is 85802945416.

It can be written as a sum of positive squares in 3 ways, for example, as 57344444089 + 4110476769 = 239467^2 + 64113^2 .

It is not an unprimeable number, because it can be changed into a prime (61454920853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 81181816 + ... + 81182572.

Almost surely, 2^61454920858 is an apocalyptic number.

61454920858 is a deficient number, since it is larger than the sum of its proper divisors (36304577732).

61454920858 is an frugal number, since it uses more digits than its factorization.

61454920858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 61454920858 in words is "sixty-one billion, four hundred fifty-four million, nine hundred twenty thousand, eight hundred fifty-eight".