83278521305 has 16 divisors (see below), whose sum is σ = 114232255104. Its totient is φ = 57094416000.

The previous prime is 83278521301. The next prime is 83278521307. The reversal of 83278521305 is 50312587238.

It is not a de Polignac number, because 83278521305 - 2² = 83278521301 is a prime.

It is a super-2 number, since 2×83278521305² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (83278521301) 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, 37196 + ... + 409805.

It is an arithmetic number, because the mean of its divisors is an integer number (7139515944).

Almost surely, 2^83278521305 is an apocalyptic number.

It is an amenable number.

83278521305 is a deficient number, since it is larger than the sum of its proper divisors (30953733799).

83278521305 is a wasteful number, since it uses less digits than its factorization.

83278521305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452336.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 83278521305 in words is "eighty-three billion, two hundred seventy-eight million, five hundred twenty-one thousand, three hundred five".