15851551334861 has 12 divisors (see below), whose sum is σ = 18250640322624. Its totient is φ = 13652053777800.

The previous prime is 15851551334851. The next prime is 15851551334863. The reversal of 15851551334861 is 16843315515851.

It is a happy number.

15851551334861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-15851551334861 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15851551334797 and 15851551334806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15851551334863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1995910325 + ... + 1995918266.

It is an arithmetic number, because the mean of its divisors is an integer number (1520886693552).

Almost surely, 2^{15851551334861} is an apocalyptic number.

15851551334861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15851551334861 is a deficient number, since it is larger than the sum of its proper divisors (2399088987763).

15851551334861 is a wasteful number, since it uses less digits than its factorization.

15851551334861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3991828640 (or 3991828621 counting only the distinct ones).

The product of its digits is 8640000, while the sum is 56.

The spelling of 15851551334861 in words is "fifteen trillion, eight hundred fifty-one billion, five hundred fifty-one million, three hundred thirty-four thousand, eight hundred sixty-one".