781783135073 has 2 divisors, whose sum is σ = 781783135074. Its totient is φ = 781783135072.

The previous prime is 781783135069. The next prime is 781783135099. The reversal of 781783135073 is 370531387187.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 732422737489 + 49360397584 = 855817^2 + 222172^2 .

It is a cyclic number.

It is not a de Polignac number, because 781783135073 - 2² = 781783135069 is a prime.

It is a super-2 number, since 2×781783135073² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781783135013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390891567536 + 390891567537.

It is an arithmetic number, because the mean of its divisors is an integer number (390891567537).

Almost surely, 2^781783135073 is an apocalyptic number.

It is an amenable number.

781783135073 is a deficient number, since it is larger than the sum of its proper divisors (1).

781783135073 is an equidigital number, since it uses as much as digits as its factorization.

781783135073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The spelling of 781783135073 in words is "seven hundred eighty-one billion, seven hundred eighty-three million, one hundred thirty-five thousand, seventy-three".