73402020397 has 2 divisors, whose sum is σ = 73402020398. Its totient is φ = 73402020396.

The previous prime is 73402020361. The next prime is 73402020401. The reversal of 73402020397 is 79302020437.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40396578121 + 33005442276 = 200989^2 + 181674^2 .

It is an emirp because it is prime and its reverse (79302020437) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73402020397 - 2⁷ = 73402020269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73402020697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36701010198 + 36701010199.

It is an arithmetic number, because the mean of its divisors is an integer number (36701010199).

Almost surely, 2^73402020397 is an apocalyptic number.

It is an amenable number.

73402020397 is a deficient number, since it is larger than the sum of its proper divisors (1).

73402020397 is an equidigital number, since it uses as much as digits as its factorization.

73402020397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 37.

The spelling of 73402020397 in words is "seventy-three billion, four hundred two million, twenty thousand, three hundred ninety-seven".