1851851851655 has 32 divisors (see below), whose sum is σ = 2470529402880. Its totient is φ = 1323317658240.

The previous prime is 1851851851609. The next prime is 1851851851693. The reversal of 1851851851655 is 5561581581581.

It is not a de Polignac number, because 1851851851655 - 2³⁴ = 1834671982471 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1851851851594 and 1851851851603.

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, 47411564 + ... + 47450606.

It is an arithmetic number, because the mean of its divisors is an integer number (77204043840).

Almost surely, 2^{1851851851655} is an apocalyptic number.

1851851851655 is a deficient number, since it is larger than the sum of its proper divisors (618677551225).

1851851851655 is a wasteful number, since it uses less digits than its factorization.

1851851851655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62631.

The product of its digits is 9600000, while the sum is 59.

The spelling of 1851851851655 in words is "one trillion, eight hundred fifty-one billion, eight hundred fifty-one million, eight hundred fifty-one thousand, six hundred fifty-five".