15527971997 has 8 divisors (see below), whose sum is σ = 15737155680. Its totient is φ = 15319875600.

The previous prime is 15527971967. The next prime is 15527971999. The reversal of 15527971997 is 79917972551.

It is a happy number.

15527971997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 15527971997 - 2⁶ = 15527971933 is a prime.

It is a super-2 number, since 2×15527971997² (a number of 21 digits) contains 22 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 (15527971999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243047 + ... + 300212.

It is an arithmetic number, because the mean of its divisors is an integer number (1967144460).

Almost surely, 2^15527971997 is an apocalyptic number.

It is an amenable number.

15527971997 is a deficient number, since it is larger than the sum of its proper divisors (209183683).

15527971997 is a wasteful number, since it uses less digits than its factorization.

15527971997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543643.

The product of its digits is 12502350, while the sum is 62.

The spelling of 15527971997 in words is "fifteen billion, five hundred twenty-seven million, nine hundred seventy-one thousand, nine hundred ninety-seven".