6436894897 has 4 divisors (see below), whose sum is σ = 6658856820. Its totient is φ = 6214932976.

The previous prime is 6436894873. The next prime is 6436894973. The reversal of 6436894897 is 7984986346.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1031116321 + 5405778576 = 32111^2 + 73524^2 .

It is a cyclic number.

It is not a de Polignac number, because 6436894897 - 2³¹ = 4289411249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6436894837) 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, 110980918 + ... + 110980975.

It is an arithmetic number, because the mean of its divisors is an integer number (1664714205).

Almost surely, 2^6436894897 is an apocalyptic number.

It is an amenable number.

6436894897 is a deficient number, since it is larger than the sum of its proper divisors (221961923).

6436894897 is a wasteful number, since it uses less digits than its factorization.

6436894897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221961922.

The product of its digits is 62705664, while the sum is 64.

The square root of 6436894897 is about 80230.2617283528. The cubic root of 6436894897 is about 1860.1964274960.

The spelling of 6436894897 in words is "six billion, four hundred thirty-six million, eight hundred ninety-four thousand, eight hundred ninety-seven".