61051981078 has 16 divisors (see below), whose sum is σ = 105161307840. Its totient is φ = 26290326600.

The previous prime is 61051981043. The next prime is 61051981121. The reversal of 61051981078 is 87018915016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73028268 + ... + 73029103.

It is an arithmetic number, because the mean of its divisors is an integer number (6572581740).

Almost surely, 2^61051981078 is an apocalyptic number.

61051981078 is a deficient number, since it is larger than the sum of its proper divisors (44109326762).

61051981078 is a wasteful number, since it uses less digits than its factorization.

61051981078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146057403.

The product of its (nonzero) digits is 120960, while the sum is 46.

The spelling of 61051981078 in words is "sixty-one billion, fifty-one million, nine hundred eighty-one thousand, seventy-eight".