81462468491 has 2 divisors, whose sum is σ = 81462468492. Its totient is φ = 81462468490.

The previous prime is 81462468457. The next prime is 81462468499. The reversal of 81462468491 is 19486426418.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81462468491 is a prime.

It is a super-2 number, since 2×81462468491² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81462468499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40731234245 + 40731234246.

It is an arithmetic number, because the mean of its divisors is an integer number (40731234246).

Almost surely, 2^81462468491 is an apocalyptic number.

81462468491 is a deficient number, since it is larger than the sum of its proper divisors (1).

81462468491 is an equidigital number, since it uses as much as digits as its factorization.

81462468491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2654208, while the sum is 53.

The spelling of 81462468491 in words is "eighty-one billion, four hundred sixty-two million, four hundred sixty-eight thousand, four hundred ninety-one".