61515551066 has 8 divisors (see below), whose sum is σ = 92282145204. Its totient is φ = 30754836000.

The previous prime is 61515551021. The next prime is 61515551087. The reversal of 61515551066 is 66015551516.

61515551066 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 60047052025 + 1468499041 = 245045^2 + 38321^2 .

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

It is a Curzon number.

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, 1443515 + ... + 1485518.

Almost surely, 2^61515551066 is an apocalyptic number.

61515551066 is a deficient number, since it is larger than the sum of its proper divisors (30766594138).

61515551066 is a wasteful number, since it uses less digits than its factorization.

61515551066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2939536.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 61515551066 in words is "sixty-one billion, five hundred fifteen million, five hundred fifty-one thousand, sixty-six".