6421116154 has 4 divisors (see below), whose sum is σ = 9631674234. Its totient is φ = 3210558076.

The previous prime is 6421116047. The next prime is 6421116173. The reversal of 6421116154 is 4516111246.

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

It can be written as a sum of positive squares in only one way, i.e., 6308012929 + 113103225 = 79423^2 + 10635^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1605279037 + ... + 1605279040.

Almost surely, 2^6421116154 is an apocalyptic number.

6421116154 is a deficient number, since it is larger than the sum of its proper divisors (3210558080).

6421116154 is a wasteful number, since it uses less digits than its factorization.

6421116154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210558079.

The product of its digits is 5760, while the sum is 31.

The square root of 6421116154 is about 80131.8672813756. The cubic root of 6421116154 is about 1858.6752190211.

The spelling of 6421116154 in words is "six billion, four hundred twenty-one million, one hundred sixteen thousand, one hundred fifty-four".