1264561475651 has 4 divisors (see below), whose sum is σ = 1264569146400. Its totient is φ = 1264553804904.

The previous prime is 1264561475627. The next prime is 1264561475663. The reversal of 1264561475651 is 1565741654621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264561475651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1264561475593 and 1264561475602.

It is not an unprimeable number, because it can be changed into a prime (1264561415651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3582536 + ... + 3919653.

It is an arithmetic number, because the mean of its divisors is an integer number (316142286600).

Almost surely, 2^{1264561475651} is an apocalyptic number.

1264561475651 is a deficient number, since it is larger than the sum of its proper divisors (7670749).

1264561475651 is an equidigital number, since it uses as much as digits as its factorization.

1264561475651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7670748.

The product of its digits is 6048000, while the sum is 53.

The spelling of 1264561475651 in words is "one trillion, two hundred sixty-four billion, five hundred sixty-one million, four hundred seventy-five thousand, six hundred fifty-one".