400215031155251 has 8 divisors (see below), whose sum is σ = 434814969180480. Its totient is φ = 366159974044032.

The previous prime is 400215031155217. The next prime is 400215031155257. The reversal of 400215031155251 is 152551130512004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400215031155251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400215031155257) 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, 136220226971 + ... + 136220229908.

It is an arithmetic number, because the mean of its divisors is an integer number (54351871147560).

Almost surely, 2^{400215031155251} is an apocalyptic number.

400215031155251 is a deficient number, since it is larger than the sum of its proper divisors (34599938025229).

400215031155251 is a wasteful number, since it uses less digits than its factorization.

400215031155251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272440457005.

The product of its (nonzero) digits is 30000, while the sum is 35.

Adding to 400215031155251 its reverse (152551130512004), we get a palindrome (552766161667255).

The spelling of 400215031155251 in words is "four hundred trillion, two hundred fifteen billion, thirty-one million, one hundred fifty-five thousand, two hundred fifty-one".