251378453411 has 4 divisors (see below), whose sum is σ = 256121443152. Its totient is φ = 246635463672.

The previous prime is 251378453407. The next prime is 251378453441. The reversal of 251378453411 is 114354873152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 251378453411 - 2² = 251378453407 is a prime.

It is a super-2 number, since 2×251378453411² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251378453401) 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, 2371494791 + ... + 2371494896.

It is an arithmetic number, because the mean of its divisors is an integer number (64030360788).

Almost surely, 2^251378453411 is an apocalyptic number.

251378453411 is a deficient number, since it is larger than the sum of its proper divisors (4742989741).

251378453411 is an equidigital number, since it uses as much as digits as its factorization.

251378453411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742989740.

The product of its digits is 403200, while the sum is 44.

The spelling of 251378453411 in words is "two hundred fifty-one billion, three hundred seventy-eight million, four hundred fifty-three thousand, four hundred eleven".