15861740340 has 48 divisors (see below), whose sum is σ = 44426092032. Its totient is φ = 4228538496.

The previous prime is 15861740291. The next prime is 15861740347. The reversal of 15861740340 is 4304716851.

It is a super-2 number, since 2×15861740340² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15861740347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173437 + ... + 248603.

It is an arithmetic number, because the mean of its divisors is an integer number (925543584).

Almost surely, 2^15861740340 is an apocalyptic number.

15861740340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15861740340 is an abundant number, since it is smaller than the sum of its proper divisors (28564351692).

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

15861740340 is a wasteful number, since it uses less digits than its factorization.

15861740340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78696 (or 78694 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 15861740340 in words is "fifteen billion, eight hundred sixty-one million, seven hundred forty thousand, three hundred forty".