1025210125561 has 4 divisors (see below), whose sum is σ = 1025783831952. Its totient is φ = 1024636419172.

The previous prime is 1025210125523. The next prime is 1025210125567. The reversal of 1025210125561 is 1655210125201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1025210125561 - 2¹⁵ = 1025210092793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1025210125567) 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, 286850515 + ... + 286854088.

It is an arithmetic number, because the mean of its divisors is an integer number (256445957988).

Almost surely, 2^{1025210125561} is an apocalyptic number.

It is an amenable number.

1025210125561 is a deficient number, since it is larger than the sum of its proper divisors (573706391).

1025210125561 is an equidigital number, since it uses as much as digits as its factorization.

1025210125561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573706390.

The product of its (nonzero) digits is 6000, while the sum is 31.

The spelling of 1025210125561 in words is "one trillion, twenty-five billion, two hundred ten million, one hundred twenty-five thousand, five hundred sixty-one".