1855420613538 has 16 divisors (see below), whose sum is σ = 3906148660320. Its totient is φ = 585922298976.

The previous prime is 1855420613537. The next prime is 1855420613539. The reversal of 1855420613538 is 8353160245581.

It is an interprime number because it is at equal distance from previous prime (1855420613537) and next prime (1855420613539).

It is a super-3 number, since 3×1855420613538³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1855420613537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8137809595 + ... + 8137809822.

It is an arithmetic number, because the mean of its divisors is an integer number (244134291270).

Almost surely, 2^{1855420613538} is an apocalyptic number.

1855420613538 is an abundant number, since it is smaller than the sum of its proper divisors (2050728046782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1855420613538 is a wasteful number, since it uses less digits than its factorization.

1855420613538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16275619441.

The product of its (nonzero) digits is 3456000, while the sum is 51.

The spelling of 1855420613538 in words is "one trillion, eight hundred fifty-five billion, four hundred twenty million, six hundred thirteen thousand, five hundred thirty-eight".