1251662605632 has 84 divisors (see below), whose sum is σ = 3798704003796. Its totient is φ = 392678461440.

The previous prime is 1251662605621. The next prime is 1251662605673. The reversal of 1251662605632 is 2365062661521.

1251662605632 is a `hidden beast` number, since 1 + 2 + 5 + 1 + 6 + 6 + 2 + 6 + 0 + 5 + 632 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 798335102016 + 453327503616 = 893496^2 + 673296^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63902719 + ... + 63922302.

Almost surely, 2^{1251662605632} is an apocalyptic number.

1251662605632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1251662605632 is an abundant number, since it is smaller than the sum of its proper divisors (2547041398164).

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

1251662605632 is a wasteful number, since it uses less digits than its factorization.

1251662605632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127825056 (or 127825043 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 1251662605632 in words is "one trillion, two hundred fifty-one billion, six hundred sixty-two million, six hundred five thousand, six hundred thirty-two".