16545661607570 has 64 divisors (see below), whose sum is σ = 31819336829280. Its totient is φ = 6172766502912.

The previous prime is 16545661607561. The next prime is 16545661607593. The reversal of 16545661607570 is 7570616654561.

It can be written as a sum of positive squares in 16 ways, for example, as 8593639483081 + 7952022124489 = 2931491^2 + 2819933^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12822716 + ... + 14053944.

Almost surely, 2^{16545661607570} is an apocalyptic number.

16545661607570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16545661607570 is a deficient number, since it is larger than the sum of its proper divisors (15273675221710).

16545661607570 is a wasteful number, since it uses less digits than its factorization.

16545661607570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231967.

The product of its (nonzero) digits is 31752000, while the sum is 59.

The spelling of 16545661607570 in words is "sixteen trillion, five hundred forty-five billion, six hundred sixty-one million, six hundred seven thousand, five hundred seventy".