1351266250640 has 40 divisors (see below), whose sum is σ = 3141886009848. Its totient is φ = 540473472000.

The previous prime is 1351266250603. The next prime is 1351266250699. The reversal of 1351266250640 is 460526621531.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 246555943936 + 1104710306704 = 496544^2 + 1051052^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 822890 + ... + 1838390.

Almost surely, 2^{1351266250640} is an apocalyptic number.

1351266250640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1351266250640 is an abundant number, since it is smaller than the sum of its proper divisors (1790619759208).

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

1351266250640 is a wasteful number, since it uses less digits than its factorization.

1351266250640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032147 (or 1032141 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 1351266250640 in words is "one trillion, three hundred fifty-one billion, two hundred sixty-six million, two hundred fifty thousand, six hundred forty".