16397121536730 has 144 divisors (see below), whose sum is σ = 49326878633760. Its totient is φ = 3765846047040.

The previous prime is 16397121536713. The next prime is 16397121536737. The reversal of 16397121536730 is 3763512179361.

It is a happy number.

16397121536730 is a `hidden beast` number, since 1 + 6 + 3 + 9 + 71 + 2 + 1 + 536 + 7 + 30 = 666.

16397121536730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (16397121536737) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 39416892 + ... + 39830711.

It is an arithmetic number, because the mean of its divisors is an integer number (342547768290).

Almost surely, 2^{16397121536730} is an apocalyptic number.

16397121536730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16397121536730 is an abundant number, since it is smaller than the sum of its proper divisors (32929757097030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16397121536730 is a wasteful number, since it uses less digits than its factorization.

16397121536730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79247657 (or 79247643 counting only the distinct ones).

The product of its (nonzero) digits is 4286520, while the sum is 54.

The spelling of 16397121536730 in words is "sixteen trillion, three hundred ninety-seven billion, one hundred twenty-one million, five hundred thirty-six thousand, seven hundred thirty".