20161634747 has 4 divisors (see below), whose sum is σ = 20162936976. Its totient is φ = 20160332520.

The previous prime is 20161634741. The next prime is 20161634771. The reversal of 20161634747 is 74743616102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20161634747 - 2¹⁴ = 20161618363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20161634741) 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, 627608 + ... + 658949.

It is an arithmetic number, because the mean of its divisors is an integer number (5040734244).

Almost surely, 2^20161634747 is an apocalyptic number.

20161634747 is a deficient number, since it is larger than the sum of its proper divisors (1302229).

20161634747 is a wasteful number, since it uses less digits than its factorization.

20161634747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302228.

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 20161634747 in words is "twenty billion, one hundred sixty-one million, six hundred thirty-four thousand, seven hundred forty-seven".