74199667921 has 2 divisors, whose sum is σ = 74199667922. Its totient is φ = 74199667920.

The previous prime is 74199667907. The next prime is 74199667973. The reversal of 74199667921 is 12976699147.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41920515025 + 32279152896 = 204745^2 + 179664^2 .

It is a cyclic number.

It is not a de Polignac number, because 74199667921 - 2⁵ = 74199667889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74199667921.

It is not a weakly prime, because it can be changed into another prime (74199667121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37099833960 + 37099833961.

It is an arithmetic number, because the mean of its divisors is an integer number (37099833961).

Almost surely, 2^74199667921 is an apocalyptic number.

It is an amenable number.

74199667921 is a deficient number, since it is larger than the sum of its proper divisors (1).

74199667921 is an equidigital number, since it uses as much as digits as its factorization.

74199667921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 61.

The spelling of 74199667921 in words is "seventy-four billion, one hundred ninety-nine million, six hundred sixty-seven thousand, nine hundred twenty-one".