61091679402890 has 32 divisors (see below), whose sum is σ = 116438162366160. Its totient is φ = 22998310124544.

The previous prime is 61091679402877. The next prime is 61091679402977. The reversal of 61091679402890 is 9820497619016.

61091679402890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 49507955643721 + 11583723759169 = 7036189^2 + 3403487^2 .

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2796977 + ... + 11402036.

Almost surely, 2^{61091679402890} is an apocalyptic number.

61091679402890 is a deficient number, since it is larger than the sum of its proper divisors (55346482963270).

61091679402890 is a wasteful number, since it uses less digits than its factorization.

61091679402890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14224346.

The product of its (nonzero) digits is 11757312, while the sum is 62.

The spelling of 61091679402890 in words is "sixty-one trillion, ninety-one billion, six hundred seventy-nine million, four hundred two thousand, eight hundred ninety".