15997947577309 has 16 divisors (see below), whose sum is σ = 17617710862080. Its totient is φ = 14471690999040.

The previous prime is 15997947577307. The next prime is 15997947577369. The reversal of 15997947577309 is 90377574979951.

It is a cyclic number.

It is not a de Polignac number, because 15997947577309 - 2¹ = 15997947577307 is a prime.

It is a super-3 number, since 3×15997947577309³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15997947577303) 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, 218436984 + ... + 218510209.

It is an arithmetic number, because the mean of its divisors is an integer number (1101106928880).

Almost surely, 2^{15997947577309} is an apocalyptic number.

15997947577309 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

15997947577309 is a deficient number, since it is larger than the sum of its proper divisors (1619763284771).

15997947577309 is a wasteful number, since it uses less digits than its factorization.

15997947577309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436947300.

The product of its (nonzero) digits is 4725888300, while the sum is 82.

The spelling of 15997947577309 in words is "fifteen trillion, nine hundred ninety-seven billion, nine hundred forty-seven million, five hundred seventy-seven thousand, three hundred nine".