1851612516 has 216 divisors, whose sum is σ = 5465154240. Its totient is φ = 524430720.

The previous prime is 1851612481. The next prime is 1851612527. The reversal of 1851612516 is 6152161581.

1851612516 is a `hidden beast` number, since 1 + 8 + 516 + 125 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10344115 + ... + 10344293.

It is an arithmetic number, because the mean of its divisors is an integer number (25301640).

Almost surely, 2^1851612516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1851612516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2732577120).

1851612516 is an abundant number, since it is smaller than the sum of its proper divisors (3613541724).

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

1851612516 is a wasteful number, since it uses less digits than its factorization.

1851612516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 251 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 1851612516 is about 43030.3673700330. The cubic root of 1851612516 is about 1227.9575940185.

The spelling of 1851612516 in words is "one billion, eight hundred fifty-one million, six hundred twelve thousand, five hundred sixteen".