845018721285 has 32 divisors (see below), whose sum is σ = 1431775232640. Its totient is φ = 424102821888.

The previous prime is 845018721257. The next prime is 845018721347. The reversal of 845018721285 is 582127810548.

It is not a de Polignac number, because 845018721285 - 2¹⁰ = 845018720261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1484229 + ... + 1973061.

It is an arithmetic number, because the mean of its divisors is an integer number (44742976020).

Almost surely, 2^845018721285 is an apocalyptic number.

845018721285 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

845018721285 is a deficient number, since it is larger than the sum of its proper divisors (586756511355).

845018721285 is a wasteful number, since it uses less digits than its factorization.

845018721285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495637.

The product of its (nonzero) digits is 1433600, while the sum is 51.

The spelling of 845018721285 in words is "eight hundred forty-five billion, eighteen million, seven hundred twenty-one thousand, two hundred eighty-five".