15601893981 has 8 divisors (see below), whose sum is σ = 20804081760. Its totient is φ = 10400484432.

The previous prime is 15601893961. The next prime is 15601894003. The reversal of 15601893981 is 18939810651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15601893981 - 2⁹ = 15601893469 is a prime.

It is a super-2 number, since 2×15601893981² (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 (15601893911) 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, 146050 + ... + 229203.

It is an arithmetic number, because the mean of its divisors is an integer number (2600510220).

Almost surely, 2^15601893981 is an apocalyptic number.

It is an amenable number.

15601893981 is a deficient number, since it is larger than the sum of its proper divisors (5202187779).

15601893981 is a wasteful number, since it uses less digits than its factorization.

15601893981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389115.

The product of its (nonzero) digits is 466560, while the sum is 51.

The spelling of 15601893981 in words is "fifteen billion, six hundred one million, eight hundred ninety-three thousand, nine hundred eighty-one".