643161154 has 8 divisors (see below), whose sum is σ = 995862528. Its totient is φ = 311206980.

The previous prime is 643161151. The next prime is 643161173. The reversal of 643161154 is 451161346.

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

It is a super-2 number, since 2×643161154² = 827312540029223432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (643161151) 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, 5186722 + ... + 5186845.

It is an arithmetic number, because the mean of its divisors is an integer number (124482816).

Almost surely, 2^643161154 is an apocalyptic number.

643161154 is a deficient number, since it is larger than the sum of its proper divisors (352701374).

643161154 is a wasteful number, since it uses less digits than its factorization.

643161154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10373600.

The product of its digits is 8640, while the sum is 31.

The square root of 643161154 is about 25360.6221138205. The cubic root of 643161154 is about 863.1904004847.

The spelling of 643161154 in words is "six hundred forty-three million, one hundred sixty-one thousand, one hundred fifty-four".