75651921973 has 2 divisors, whose sum is σ = 75651921974. Its totient is φ = 75651921972.

The previous prime is 75651921971. The next prime is 75651921991. The reversal of 75651921973 is 37912915657.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47381534929 + 28270387044 = 217673^2 + 168138^2 .

It is a cyclic number.

It is not a de Polignac number, because 75651921973 - 2¹ = 75651921971 is a prime.

Together with 75651921971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75651921971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37825960986 + 37825960987.

It is an arithmetic number, because the mean of its divisors is an integer number (37825960987).

Almost surely, 2^75651921973 is an apocalyptic number.

It is an amenable number.

75651921973 is a deficient number, since it is larger than the sum of its proper divisors (1).

75651921973 is an equidigital number, since it uses as much as digits as its factorization.

75651921973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3572100, while the sum is 55.

The spelling of 75651921973 in words is "seventy-five billion, six hundred fifty-one million, nine hundred twenty-one thousand, nine hundred seventy-three".