781649358011 has 2 divisors, whose sum is σ = 781649358012. Its totient is φ = 781649358010.

The previous prime is 781649357971. The next prime is 781649358019. The reversal of 781649358011 is 110853946187.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 781649358011 - 2⁶ = 781649357947 is a prime.

It is a super-2 number, since 2×781649358011² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781649358019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390824679005 + 390824679006.

It is an arithmetic number, because the mean of its divisors is an integer number (390824679006).

Almost surely, 2^781649358011 is an apocalyptic number.

781649358011 is a deficient number, since it is larger than the sum of its proper divisors (1).

781649358011 is an equidigital number, since it uses as much as digits as its factorization.

781649358011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 781649358011 in words is "seven hundred eighty-one billion, six hundred forty-nine million, three hundred fifty-eight thousand, eleven".