67399961 has 2 divisors, whose sum is σ = 67399962. Its totient is φ = 67399960.

The previous prime is 67399939. The next prime is 67399979. The reversal of 67399961 is 16999376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66667225 + 732736 = 8165^2 + 856^2 .

It is a cyclic number.

It is not a de Polignac number, because 67399961 - 2¹⁴ = 67383577 is a prime.

It is not a weakly prime, because it can be changed into another prime (67399991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33699980 + 33699981.

It is an arithmetic number, because the mean of its divisors is an integer number (33699981).

Almost surely, 2^67399961 is an apocalyptic number.

It is an amenable number.

67399961 is a deficient number, since it is larger than the sum of its proper divisors (1).

67399961 is an equidigital number, since it uses as much as digits as its factorization.

67399961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 50.

The square root of 67399961 is about 8209.7479254847. The cubic root of 67399961 is about 406.9613966489.

The spelling of 67399961 in words is "sixty-seven million, three hundred ninety-nine thousand, nine hundred sixty-one".