61211602066 has 8 divisors (see below), whose sum is σ = 92726486604. Its totient is φ = 30302773200.

The previous prime is 61211602061. The next prime is 61211602099. The reversal of 61211602066 is 66020611216.

61211602066 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 55238630841 + 5972971225 = 235029^2 + 77285^2 .

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

It is not an unprimeable number, because it can be changed into a prime (61211602061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151513665 + ... + 151514068.

Almost surely, 2^61211602066 is an apocalyptic number.

61211602066 is a deficient number, since it is larger than the sum of its proper divisors (31514884538).

61211602066 is a wasteful number, since it uses less digits than its factorization.

61211602066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303027836.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 61211602066 in words is "sixty-one billion, two hundred eleven million, six hundred two thousand, sixty-six".