61666796858 has 8 divisors (see below), whose sum is σ = 93318781428. Its totient is φ = 30560536384.

The previous prime is 61666796839. The next prime is 61666796869. The reversal of 61666796858 is 85869766616.

It is a happy number.

61666796858 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 2 ways, for example, as 59571629329 + 2095167529 = 244073^2 + 45773^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136430741 + ... + 136431192.

Almost surely, 2^61666796858 is an apocalyptic number.

61666796858 is a deficient number, since it is larger than the sum of its proper divisors (31651984570).

61666796858 is a wasteful number, since it uses less digits than its factorization.

61666796858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272862048.

The product of its digits is 156764160, while the sum is 68.

The spelling of 61666796858 in words is "sixty-one billion, six hundred sixty-six million, seven hundred ninety-six thousand, eight hundred fifty-eight".