15566391040 has 72 divisors (see below), whose sum is σ = 37735861968. Its totient is φ = 6151495680.

The previous prime is 15566391031. The next prime is 15566391067. The reversal of 15566391040 is 4019366551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 15566390984 and 15566391002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32980 + ... + 179500.

It is an arithmetic number, because the mean of its divisors is an integer number (524109194).

Almost surely, 2^15566391040 is an apocalyptic number.

15566391040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15566391040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18867930984).

15566391040 is an abundant number, since it is smaller than the sum of its proper divisors (22169470928).

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

15566391040 is an equidigital number, since it uses as much as digits as its factorization.

15566391040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146625 (or 146611 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 40.

The spelling of 15566391040 in words is "fifteen billion, five hundred sixty-six million, three hundred ninety-one thousand, forty".