400001617651 has 8 divisors (see below), whose sum is σ = 400268258208. Its totient is φ = 399735072000.

The previous prime is 400001617627. The next prime is 400001617679. The reversal of 400001617651 is 156716100004.

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

It is a cyclic number.

It is not a de Polignac number, because 400001617651 - 2⁵ = 400001617619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400001617601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9683221 + ... + 9724441.

It is an arithmetic number, because the mean of its divisors is an integer number (50033532276).

Almost surely, 2^400001617651 is an apocalyptic number.

400001617651 is a deficient number, since it is larger than the sum of its proper divisors (266640557).

400001617651 is a wasteful number, since it uses less digits than its factorization.

400001617651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47453.

The product of its (nonzero) digits is 5040, while the sum is 31.

Adding to 400001617651 its reverse (156716100004), we get a palindrome (556717717655).

The spelling of 400001617651 in words is "four hundred billion, one million, six hundred seventeen thousand, six hundred fifty-one".