1251643396026 has 16 divisors (see below), whose sum is σ = 2508385141728. Its totient is φ = 416364740400.

The previous prime is 1251643396021. The next prime is 1251643396033. The reversal of 1251643396026 is 6206933461521.

It is a super-2 number, since 2×1251643396026² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1251643396021) 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, 212428045 + ... + 212433936.

It is an arithmetic number, because the mean of its divisors is an integer number (156774071358).

Almost surely, 2^{1251643396026} is an apocalyptic number.

1251643396026 is an abundant number, since it is smaller than the sum of its proper divisors (1256741745702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251643396026 is a wasteful number, since it uses less digits than its factorization.

1251643396026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424862477.

The product of its (nonzero) digits is 1399680, while the sum is 48.

The spelling of 1251643396026 in words is "one trillion, two hundred fifty-one billion, six hundred forty-three million, three hundred ninety-six thousand, twenty-six".