1245705855 has 64 divisors (see below), whose sum is σ = 2155507200. Its totient is φ = 612085760.

The previous prime is 1245705847. The next prime is 1245705869. The reversal of 1245705855 is 5585075421.

It is not a de Polignac number, because 1245705855 - 2³ = 1245705847 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2972836 + ... + 2973254.

It is an arithmetic number, because the mean of its divisors is an integer number (33679800).

Almost surely, 2^1245705855 is an apocalyptic number.

1245705855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1245705855 is a deficient number, since it is larger than the sum of its proper divisors (909801345).

1245705855 is a wasteful number, since it uses less digits than its factorization.

1245705855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664.

The product of its (nonzero) digits is 280000, while the sum is 42.

The square root of 1245705855 is about 35294.5584332769. The cubic root of 1245705855 is about 1075.9824024683.

The spelling of 1245705855 in words is "one billion, two hundred forty-five million, seven hundred five thousand, eight hundred fifty-five".