61312651766 has 4 divisors (see below), whose sum is σ = 91968977652. Its totient is φ = 30656325882.

The previous prime is 61312651753. The next prime is 61312651769. The reversal of 61312651766 is 66715621316.

61312651766 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61312651769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15328162940 + ... + 15328162943.

It is an arithmetic number, because the mean of its divisors is an integer number (22992244413).

Almost surely, 2^61312651766 is an apocalyptic number.

61312651766 is a deficient number, since it is larger than the sum of its proper divisors (30656325886).

61312651766 is a wasteful number, since it uses less digits than its factorization.

61312651766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30656325885.

The product of its digits is 272160, while the sum is 44.

The spelling of 61312651766 in words is "sixty-one billion, three hundred twelve million, six hundred fifty-one thousand, seven hundred sixty-six".