61672152121 has 2 divisors, whose sum is σ = 61672152122. Its totient is φ = 61672152120.

The previous prime is 61672152053. The next prime is 61672152163. The reversal of 61672152121 is 12125127616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52734529600 + 8937622521 = 229640^2 + 94539^2 .

It is a cyclic number.

It is not a de Polignac number, because 61672152121 - 2⁷ = 61672151993 is a prime.

It is not a weakly prime, because it can be changed into another prime (61672152181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30836076060 + 30836076061.

It is an arithmetic number, because the mean of its divisors is an integer number (30836076061).

Almost surely, 2^61672152121 is an apocalyptic number.

It is an amenable number.

61672152121 is a deficient number, since it is larger than the sum of its proper divisors (1).

61672152121 is an equidigital number, since it uses as much as digits as its factorization.

61672152121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

Adding to 61672152121 its reverse (12125127616), we get a palindrome (73797279737).

The spelling of 61672152121 in words is "sixty-one billion, six hundred seventy-two million, one hundred fifty-two thousand, one hundred twenty-one".