1250745661 has 24 divisors (see below), whose sum is σ = 1471831200. Its totient is φ = 1058824800.

The previous prime is 1250745653. The next prime is 1250745667. The reversal of 1250745661 is 1665470521.

It is a happy number.

It is not a de Polignac number, because 1250745661 - 2³ = 1250745653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1250745661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1250745667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131031 + ... + 140251.

It is an arithmetic number, because the mean of its divisors is an integer number (61326300).

Almost surely, 2^1250745661 is an apocalyptic number.

1250745661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1250745661 is a deficient number, since it is larger than the sum of its proper divisors (221085539).

1250745661 is a wasteful number, since it uses less digits than its factorization.

1250745661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9321 (or 9310 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 1250745661 is about 35365.8827261529. The cubic root of 1250745661 is about 1077.4314994952.

The spelling of 1250745661 in words is "one billion, two hundred fifty million, seven hundred forty-five thousand, six hundred sixty-one".