72421973095691 has 2 divisors, whose sum is σ = 72421973095692. Its totient is φ = 72421973095690.

The previous prime is 72421973095673. The next prime is 72421973095727. The reversal of 72421973095691 is 19659037912427.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72421973095691 - 2³⁰ = 72420899353867 is a prime.

It is not a weakly prime, because it can be changed into another prime (72421973595691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36210986547845 + 36210986547846.

It is an arithmetic number, because the mean of its divisors is an integer number (36210986547846).

Almost surely, 2^{72421973095691} is an apocalyptic number.

72421973095691 is a deficient number, since it is larger than the sum of its proper divisors (1).

72421973095691 is an equidigital number, since it uses as much as digits as its factorization.

72421973095691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51438240, while the sum is 65.

The spelling of 72421973095691 in words is "seventy-two trillion, four hundred twenty-one billion, nine hundred seventy-three million, ninety-five thousand, six hundred ninety-one".