15721151011066 has 8 divisors (see below), whose sum is σ = 24394889500020. Its totient is φ = 7589521177728.

The previous prime is 15721151011061. The next prime is 15721151011109. The reversal of 15721151011066 is 66011015112751.

It can be written as a sum of positive squares in 2 ways, for example, as 15212503903041 + 508647108025 = 3900321^2 + 713195^2 .

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

It is a super-2 number, since 2×15721151011066² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15721151011061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135527163831 + ... + 135527163946.

Almost surely, 2^{15721151011066} is an apocalyptic number.

15721151011066 is a deficient number, since it is larger than the sum of its proper divisors (8673738488954).

15721151011066 is a wasteful number, since it uses less digits than its factorization.

15721151011066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271054327808.

The product of its (nonzero) digits is 12600, while the sum is 37.

The spelling of 15721151011066 in words is "fifteen trillion, seven hundred twenty-one billion, one hundred fifty-one million, eleven thousand, sixty-six".