1252788801640 has 32 divisors (see below), whose sum is σ = 2984585087880. Its totient is φ = 471638136832.

The previous prime is 1252788801601. The next prime is 1252788801673. The reversal of 1252788801640 is 461088872521.

It can be written as a sum of positive squares in 4 ways, for example, as 1167207979876 + 85580821764 = 1080374^2 + 292542^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 921167557 + ... + 921168916.

Almost surely, 2^{1252788801640} is an apocalyptic number.

1252788801640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1252788801640 is an abundant number, since it is smaller than the sum of its proper divisors (1731796286240).

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

1252788801640 is a wasteful number, since it uses less digits than its factorization.

1252788801640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842336501 (or 1842336497 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 52.

The spelling of 1252788801640 in words is "one trillion, two hundred fifty-two billion, seven hundred eighty-eight million, eight hundred one thousand, six hundred forty".