1252751015781 has 24 divisors (see below), whose sum is σ = 1883849967480. Its totient is φ = 801232338816.

The previous prime is 1252751015629. The next prime is 1252751015797. The reversal of 1252751015781 is 1875101572521.

1252751015781 is a `hidden beast` number, since 1 + 2 + 5 + 2 + 7 + 510 + 1 + 57 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2804655681 + 1249946360100 = 52959^2 + 1118010^2 .

It is not a de Polignac number, because 1252751015781 - 2³¹ = 1250603532133 is a prime.

It is a super-2 number, since 2×1252751015781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252751010781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15245050 + ... + 15327003.

It is an arithmetic number, because the mean of its divisors is an integer number (78493748645).

Almost surely, 2^{1252751015781} is an apocalyptic number.

It is an amenable number.

1252751015781 is a deficient number, since it is larger than the sum of its proper divisors (631098951699).

1252751015781 is a wasteful number, since it uses less digits than its factorization.

1252751015781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30572245 (or 30572242 counting only the distinct ones).

The product of its (nonzero) digits is 196000, while the sum is 45.

The spelling of 1252751015781 in words is "one trillion, two hundred fifty-two billion, seven hundred fifty-one million, fifteen thousand, seven hundred eighty-one".