15661601343 has 20 divisors (see below), whose sum is σ = 23779269448. Its totient is φ = 10269899280.

The previous prime is 15661601327. The next prime is 15661601363. The reversal of 15661601343 is 34310616651.

15661601343 is a `hidden beast` number, since 1 + 5 + 6 + 6 + 1 + 601 + 3 + 43 = 666.

It is not a de Polignac number, because 15661601343 - 2⁴ = 15661601327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15661601298 and 15661601307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15661601303) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1579921 + ... + 1589802.

Almost surely, 2^15661601343 is an apocalyptic number.

15661601343 is a deficient number, since it is larger than the sum of its proper divisors (8117668105).

15661601343 is an equidigital number, since it uses as much as digits as its factorization.

15661601343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3169796 (or 3169787 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 15661601343 in words is "fifteen billion, six hundred sixty-one million, six hundred one thousand, three hundred forty-three".