61378489073 has 16 divisors (see below), whose sum is σ = 67961928960. Its totient is φ = 54968144400.

The previous prime is 61378489013. The next prime is 61378489097. The reversal of 61378489073 is 37098487316.

It is a cyclic number.

It is not a de Polignac number, because 61378489073 - 2²² = 61374294769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61378489013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65018 + ... + 356348.

It is an arithmetic number, because the mean of its divisors is an integer number (4247620560).

Almost surely, 2^61378489073 is an apocalyptic number.

It is an amenable number.

61378489073 is a deficient number, since it is larger than the sum of its proper divisors (6583439887).

61378489073 is a wasteful number, since it uses less digits than its factorization.

61378489073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291628.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 61378489073 in words is "sixty-one billion, three hundred seventy-eight million, four hundred eighty-nine thousand, seventy-three".