1251553203464 has 16 divisors (see below), whose sum is σ = 2427581645100. Its totient is φ = 604198098112.

The previous prime is 1251553203457. The next prime is 1251553203521. The reversal of 1251553203464 is 4643023551521.

It can be written as a sum of positive squares in 2 ways, for example, as 1226427783364 + 25125420100 = 1107442^2 + 158510^2 .

It is a super-2 number, since 2×1251553203464² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2697312707 + ... + 2697313170.

Almost surely, 2^{1251553203464} is an apocalyptic number.

It is an amenable number.

1251553203464 is a deficient number, since it is larger than the sum of its proper divisors (1176028441636).

1251553203464 is a wasteful number, since it uses less digits than its factorization.

1251553203464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5394625912 (or 5394625908 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 41.

Adding to 1251553203464 its reverse (4643023551521), we get a palindrome (5894576754985).

The spelling of 1251553203464 in words is "one trillion, two hundred fifty-one billion, five hundred fifty-three million, two hundred three thousand, four hundred sixty-four".