781018020057 has 16 divisors (see below), whose sum is σ = 1136147044032. Its totient is φ = 473293907520.

The previous prime is 781018020053. The next prime is 781018020059. The reversal of 781018020057 is 750020810187.

It is not a de Polignac number, because 781018020057 - 2² = 781018020053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 781018019997 and 781018020024.

It is not an unprimeable number, because it can be changed into a prime (781018020053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 942538 + ... + 1565379.

It is an arithmetic number, because the mean of its divisors is an integer number (71009190252).

Almost surely, 2^781018020057 is an apocalyptic number.

It is an amenable number.

781018020057 is a deficient number, since it is larger than the sum of its proper divisors (355129023975).

781018020057 is a wasteful number, since it uses less digits than its factorization.

781018020057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2517368.

The product of its (nonzero) digits is 31360, while the sum is 39.

The spelling of 781018020057 in words is "seven hundred eighty-one billion, eighteen million, twenty thousand, fifty-seven".