61650166601 has 2 divisors, whose sum is σ = 61650166602. Its totient is φ = 61650166600.

The previous prime is 61650166541. The next prime is 61650166607. The reversal of 61650166601 is 10666105616.

It is a happy number.

61650166601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52670709001 + 8979457600 = 229501^2 + 94760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61650166601 is a prime.

It is not a weakly prime, because it can be changed into another prime (61650166607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30825083300 + 30825083301.

It is an arithmetic number, because the mean of its divisors is an integer number (30825083301).

Almost surely, 2^61650166601 is an apocalyptic number.

It is an amenable number.

61650166601 is a deficient number, since it is larger than the sum of its proper divisors (1).

61650166601 is an equidigital number, since it uses as much as digits as its factorization.

61650166601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 61650166601 in words is "sixty-one billion, six hundred fifty million, one hundred sixty-six thousand, six hundred one".