1260561021645 has 8 divisors (see below), whose sum is σ = 2016897634656. Its totient is φ = 672299211536.

The previous prime is 1260561021631. The next prime is 1260561021659. The reversal of 1260561021645 is 5461201650621.

It is an interprime number because it is at equal distance from previous prime (1260561021631) and next prime (1260561021659).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1260561021645 - 2⁶ = 1260561021581 is a prime.

It is a super-3 number, since 3×1260561021645³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

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, 42018700707 + ... + 42018700736.

It is an arithmetic number, because the mean of its divisors is an integer number (252112204332).

Almost surely, 2^{1260561021645} is an apocalyptic number.

1260561021645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1260561021645 is a deficient number, since it is larger than the sum of its proper divisors (756336613011).

1260561021645 is an equidigital number, since it uses as much as digits as its factorization.

1260561021645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84037401451.

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 1260561021645 in words is "one trillion, two hundred sixty billion, five hundred sixty-one million, twenty-one thousand, six hundred forty-five".