1656724231081 has 2 divisors, whose sum is σ = 1656724231082. Its totient is φ = 1656724231080.

The previous prime is 1656724231039. The next prime is 1656724231087. The reversal of 1656724231081 is 1801324276561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 842788261225 + 813935969856 = 918035^2 + 902184^2 .

It is a cyclic number.

It is not a de Polignac number, because 1656724231081 - 2²¹ = 1656722133929 is a prime.

It is a super-2 number, since 2×1656724231081² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1656724231087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828362115540 + 828362115541.

It is an arithmetic number, because the mean of its divisors is an integer number (828362115541).

Almost surely, 2^{1656724231081} is an apocalyptic number.

It is an amenable number.

1656724231081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656724231081 is an equidigital number, since it uses as much as digits as its factorization.

1656724231081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 1656724231081 in words is "one trillion, six hundred fifty-six billion, seven hundred twenty-four million, two hundred thirty-one thousand, eighty-one".