73551771054991 has 2 divisors, whose sum is σ = 73551771054992. Its totient is φ = 73551771054990.

The previous prime is 73551771054989. The next prime is 73551771055043. The reversal of 73551771054991 is 19945017715537.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 73551771054991 - 2¹ = 73551771054989 is a prime.

It is a super-2 number, since 2×73551771054991² (a number of 29 digits) contains 22 as substring.

Together with 73551771054989, 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 (73551771054901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36775885527495 + 36775885527496.

It is an arithmetic number, because the mean of its divisors is an integer number (36775885527496).

Almost surely, 2^{73551771054991} is an apocalyptic number.

73551771054991 is a deficient number, since it is larger than the sum of its proper divisors (1).

73551771054991 is an equidigital number, since it uses as much as digits as its factorization.

73551771054991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41674500, while the sum is 64.

The spelling of 73551771054991 in words is "seventy-three trillion, five hundred fifty-one billion, seven hundred seventy-one million, fifty-four thousand, nine hundred ninety-one".