6718921425 has 36 divisors (see below), whose sum is σ = 12290403840. Its totient is φ = 3507176160.

The previous prime is 6718921421. The next prime is 6718921457. The reversal of 6718921425 is 5241298176.

It is not a de Polignac number, because 6718921425 - 2² = 6718921421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (6718921421) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 307105 + ... + 328254.

Almost surely, 2^6718921425 is an apocalyptic number.

It is an amenable number.

6718921425 is a deficient number, since it is larger than the sum of its proper divisors (5571482415).

6718921425 is a wasteful number, since it uses less digits than its factorization.

6718921425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635422 (or 635414 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 6718921425 is about 81969.0272298019. The cubic root of 6718921425 is about 1886.9766266694.

The spelling of 6718921425 in words is "six billion, seven hundred eighteen million, nine hundred twenty-one thousand, four hundred twenty-five".