251400042166 has 48 divisors (see below), whose sum is σ = 475478675424. Its totient is φ = 97578404352.

The previous prime is 251400042119. The next prime is 251400042233. The reversal of 251400042166 is 661240004152.

It is a happy number.

251400042166 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 877011 + ... + 1127806.

It is an arithmetic number, because the mean of its divisors is an integer number (9905805738).

Almost surely, 2^251400042166 is an apocalyptic number.

251400042166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

251400042166 is a deficient number, since it is larger than the sum of its proper divisors (224078633258).

251400042166 is a wasteful number, since it uses less digits than its factorization.

251400042166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004905 (or 2004892 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 251400042166 in words is "two hundred fifty-one billion, four hundred million, forty-two thousand, one hundred sixty-six".