61770721106 has 16 divisors (see below), whose sum is σ = 93028725504. Its totient is φ = 30761197824.

The previous prime is 61770721099. The next prime is 61770721279. The reversal of 61770721106 is 60112707716.

It is a happy number.

61770721106 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 61770721106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3121415 + ... + 3141141.

It is an arithmetic number, because the mean of its divisors is an integer number (5814295344).

Almost surely, 2^61770721106 is an apocalyptic number.

61770721106 is a deficient number, since it is larger than the sum of its proper divisors (31258004398).

61770721106 is a wasteful number, since it uses less digits than its factorization.

61770721106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25945.

The product of its (nonzero) digits is 24696, while the sum is 38.

The spelling of 61770721106 in words is "sixty-one billion, seven hundred seventy million, seven hundred twenty-one thousand, one hundred six".