1861852063009 has 9 divisors (see below), whose sum is σ = 1870401349681. Its totient is φ = 1853341695220.

The previous prime is 1861852062953. The next prime is 1861852063051. The reversal of 1861852063009 is 9003602581681.

The square root of 1861852063009 is 1364497.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1861852063009 - 2³¹ = 1859704579361 is a prime.

It is a super-2 number, since 2×1861852063009² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861852060009) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 309737814 + ... + 309743824.

Almost surely, 2^{1861852063009} is an apocalyptic number.

1861852063009 is the 1364497-th square number.

1861852063009 is the 682249-th centered octagonal number.

It is an amenable number.

1861852063009 is a deficient number, since it is larger than the sum of its proper divisors (8549286672).

1861852063009 is an frugal number, since it uses more digits than its factorization.

1861852063009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12476 (or 6238 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 49.

Multiplying 1861852063009 by its sum of digits (49), we get a square (91230751087441 = 9551479²).

The spelling of 1861852063009 in words is "one trillion, eight hundred sixty-one billion, eight hundred fifty-two million, sixty-three thousand, nine".