1861501842115 has 16 divisors (see below), whose sum is σ = 2271958437600. Its totient is φ = 1463957431552.

The previous prime is 1861501842041. The next prime is 1861501842121. The reversal of 1861501842115 is 5112481051681.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1861501842115 - 2³³ = 1852911907523 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12013045 + ... + 12167014.

It is an arithmetic number, because the mean of its divisors is an integer number (141997402350).

Almost surely, 2^{1861501842115} is an apocalyptic number.

1861501842115 is a deficient number, since it is larger than the sum of its proper divisors (410456595485).

1861501842115 is a wasteful number, since it uses less digits than its factorization.

1861501842115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24180326.

The product of its (nonzero) digits is 76800, while the sum is 43.

Adding to 1861501842115 its reverse (5112481051681), we get a palindrome (6973982893796).

The spelling of 1861501842115 in words is "one trillion, eight hundred sixty-one billion, five hundred one million, eight hundred forty-two thousand, one hundred fifteen".