1264990729945 has 4 divisors (see below), whose sum is σ = 1517988875940. Its totient is φ = 1011992583952.

The previous prime is 1264990729927. The next prime is 1264990729963. The reversal of 1264990729945 is 5499270994621.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1264990729927) and next prime (1264990729963).

It can be written as a sum of positive squares in 2 ways, for example, as 964269008784 + 300721721161 = 981972^2 + 548381^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264990729945 - 2¹⁷ = 1264990598873 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126499072990 + ... + 126499072999.

It is an arithmetic number, because the mean of its divisors is an integer number (379497218985).

Almost surely, 2^{1264990729945} is an apocalyptic number.

It is an amenable number.

1264990729945 is a deficient number, since it is larger than the sum of its proper divisors (252998145995).

1264990729945 is an equidigital number, since it uses as much as digits as its factorization.

1264990729945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252998145994.

The product of its (nonzero) digits is 88179840, while the sum is 67.

The spelling of 1264990729945 in words is "one trillion, two hundred sixty-four billion, nine hundred ninety million, seven hundred twenty-nine thousand, nine hundred forty-five".