61672151993 has 2 divisors, whose sum is σ = 61672151994. Its totient is φ = 61672151992.

The previous prime is 61672151951. The next prime is 61672152023. The reversal of 61672151993 is 39915127616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47590295104 + 14081856889 = 218152^2 + 118667^2 .

It is a cyclic number.

It is not a de Polignac number, because 61672151993 - 2¹² = 61672147897 is a prime.

It is not a weakly prime, because it can be changed into another prime (61672151923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30836075996 + 30836075997.

It is an arithmetic number, because the mean of its divisors is an integer number (30836075997).

Almost surely, 2^61672151993 is an apocalyptic number.

It is an amenable number.

61672151993 is a deficient number, since it is larger than the sum of its proper divisors (1).

61672151993 is an equidigital number, since it uses as much as digits as its factorization.

61672151993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 50.

The spelling of 61672151993 in words is "sixty-one billion, six hundred seventy-two million, one hundred fifty-one thousand, nine hundred ninety-three".