15806345640 has 32 divisors (see below), whose sum is σ = 47419037280. Its totient is φ = 4215025472.

The previous prime is 15806345609. The next prime is 15806345641. The reversal of 15806345640 is 4654360851.

It is a super-2 number, since 2×15806345640² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15806345592 and 15806345601.

It is not an unprimeable number, because it can be changed into a prime (15806345641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65859654 + ... + 65859893.

It is an arithmetic number, because the mean of its divisors is an integer number (1481844915).

Almost surely, 2^15806345640 is an apocalyptic number.

15806345640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15806345640 is an abundant number, since it is smaller than the sum of its proper divisors (31612691640).

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

15806345640 is a wasteful number, since it uses less digits than its factorization.

15806345640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131719561 (or 131719557 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 15806345640 in words is "fifteen billion, eight hundred six million, three hundred forty-five thousand, six hundred forty".