6646157402 has 8 divisors (see below), whose sum is σ = 10493932800. Its totient is φ = 3148179804.

The previous prime is 6646157381. The next prime is 6646157407. The reversal of 6646157402 is 2047516466.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 6646157402.

It is not an unprimeable number, because it can be changed into a prime (6646157407) 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, 87449402 + ... + 87449477.

It is an arithmetic number, because the mean of its divisors is an integer number (1311741600).

Almost surely, 2^6646157402 is an apocalyptic number.

6646157402 is a deficient number, since it is larger than the sum of its proper divisors (3847775398).

6646157402 is a wasteful number, since it uses less digits than its factorization.

6646157402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174898900.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 6646157402 is about 81523.9682670072. The cubic root of 6646157402 is about 1880.1400795352.

The spelling of 6646157402 in words is "six billion, six hundred forty-six million, one hundred fifty-seven thousand, four hundred two".