252161456451 has 4 divisors (see below), whose sum is σ = 336215275272. Its totient is φ = 168107637632.

The previous prime is 252161456423. The next prime is 252161456479. The reversal of 252161456451 is 154654161252.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (252161456423) and next prime (252161456479).

It is a cyclic number.

It is not a de Polignac number, because 252161456451 - 2⁹ = 252161455939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (252161455451) 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, 42026909406 + ... + 42026909411.

It is an arithmetic number, because the mean of its divisors is an integer number (84053818818).

Almost surely, 2^252161456451 is an apocalyptic number.

252161456451 is a deficient number, since it is larger than the sum of its proper divisors (84053818821).

252161456451 is an equidigital number, since it uses as much as digits as its factorization.

252161456451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84053818820.

The product of its digits is 288000, while the sum is 42.

The spelling of 252161456451 in words is "two hundred fifty-two billion, one hundred sixty-one million, four hundred fifty-six thousand, four hundred fifty-one".