251416206399 has 8 divisors (see below), whose sum is σ = 335231761840. Its totient is φ = 167605727616.

The previous prime is 251416206397. The next prime is 251416206439. The reversal of 251416206399 is 993602614152.

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

It is not a de Polignac number, because 251416206399 - 2¹ = 251416206397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251416206397) 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, 1152064 + ... + 1352805.

It is an arithmetic number, because the mean of its divisors is an integer number (41903970230).

Almost surely, 2^251416206399 is an apocalyptic number.

251416206399 is a deficient number, since it is larger than the sum of its proper divisors (83815555441).

251416206399 is a wasteful number, since it uses less digits than its factorization.

251416206399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538329.

The product of its (nonzero) digits is 699840, while the sum is 48.

The spelling of 251416206399 in words is "two hundred fifty-one billion, four hundred sixteen million, two hundred six thousand, three hundred ninety-nine".