15666401560 has 64 divisors (see below), whose sum is σ = 36093451680. Its totient is φ = 6116705280.

The previous prime is 15666401549. The next prime is 15666401567. The reversal of 15666401560 is 6510466651.

It is a super-2 number, since 2×15666401560² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15666401567) 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, 4334314 + ... + 4337926.

Almost surely, 2^15666401560 is an apocalyptic number.

15666401560 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 15666401560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18046725840).

15666401560 is an abundant number, since it is smaller than the sum of its proper divisors (20427050120).

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

15666401560 is a wasteful number, since it uses less digits than its factorization.

15666401560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6188 (or 6184 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 15666401560 in words is "fifteen billion, six hundred sixty-six million, four hundred one thousand, five hundred sixty".