83778931457 has 8 divisors (see below), whose sum is σ = 90304835880. Its totient is φ = 77264651520.

The previous prime is 83778931447. The next prime is 83778931477. The reversal of 83778931457 is 75413987738.

It can be written as a sum of positive squares in 4 ways, for example, as 20335900816 + 63443030641 = 142604^2 + 251879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 83778931457 - 2¹⁶ = 83778865921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83778931457.

It is not an unprimeable number, because it can be changed into a prime (83778931427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2891144 + ... + 2919977.

It is an arithmetic number, because the mean of its divisors is an integer number (11288104485).

Almost surely, 2^83778931457 is an apocalyptic number.

It is an amenable number.

83778931457 is a deficient number, since it is larger than the sum of its proper divisors (6525904423).

83778931457 is a wasteful number, since it uses less digits than its factorization.

83778931457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5812243.

The product of its digits is 35562240, while the sum is 62.

The spelling of 83778931457 in words is "eighty-three billion, seven hundred seventy-eight million, nine hundred thirty-one thousand, four hundred fifty-seven".