251220032643 has 8 divisors (see below), whose sum is σ = 354663575568. Its totient is φ = 157628255744.

The previous prime is 251220032621. The next prime is 251220032653. The reversal of 251220032643 is 346230022152.

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

It is a cyclic number.

It is not a de Polignac number, because 251220032643 - 2¹⁷ = 251219901571 is a prime.

It is a super-2 number, since 2×251220032643² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 251220032643.

It is not an unprimeable number, because it can be changed into a prime (251220032653) 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, 2462941446 + ... + 2462941547.

It is an arithmetic number, because the mean of its divisors is an integer number (44332946946).

Almost surely, 2^251220032643 is an apocalyptic number.

251220032643 is a deficient number, since it is larger than the sum of its proper divisors (103443542925).

251220032643 is a wasteful number, since it uses less digits than its factorization.

251220032643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4925883013.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 251220032643 its reverse (346230022152), we get a palindrome (597450054795).

The spelling of 251220032643 in words is "two hundred fifty-one billion, two hundred twenty million, thirty-two thousand, six hundred forty-three".