61126501666 has 4 divisors (see below), whose sum is σ = 91689752502. Its totient is φ = 30563250832.

The previous prime is 61126501663. The next prime is 61126501669. The reversal of 61126501666 is 66610562116.

61126501666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (61126501663) and next prime (61126501669).

It can be written as a sum of positive squares in only one way, i.e., 59377505625 + 1748996041 = 243675^2 + 41821^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (61126501663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15281625415 + ... + 15281625418.

Almost surely, 2^61126501666 is an apocalyptic number.

61126501666 is a deficient number, since it is larger than the sum of its proper divisors (30563250836).

61126501666 is a wasteful number, since it uses less digits than its factorization.

61126501666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30563250835.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 61126501666 in words is "sixty-one billion, one hundred twenty-six million, five hundred one thousand, six hundred sixty-six".