1855863808825 has 24 divisors (see below), whose sum is σ = 2490037530176. Its totient is φ = 1363988808000.

The previous prime is 1855863808819. The next prime is 1855863808861. The reversal of 1855863808825 is 5288083685581.

It is not a de Polignac number, because 1855863808825 - 2⁹ = 1855863808313 is a prime.

It is a super-2 number, since 2×1855863808825² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13463061 + ... + 13600210.

Almost surely, 2^{1855863808825} is an apocalyptic number.

It is an amenable number.

1855863808825 is a deficient number, since it is larger than the sum of its proper divisors (634173721351).

1855863808825 is a wasteful number, since it uses less digits than its factorization.

1855863808825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27063505 (or 27063500 counting only the distinct ones).

The product of its (nonzero) digits is 147456000, while the sum is 67.

The spelling of 1855863808825 in words is "one trillion, eight hundred fifty-five billion, eight hundred sixty-three million, eight hundred eight thousand, eight hundred twenty-five".