125826630557 has 4 divisors (see below), whose sum is σ = 128200717980. Its totient is φ = 123452543136.

The previous prime is 125826630469. The next prime is 125826630571. The reversal of 125826630557 is 755036628521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 67229229796 + 58597400761 = 259286^2 + 242069^2 .

It is a cyclic number.

It is not a de Polignac number, because 125826630557 - 2¹² = 125826626461 is a prime.

It is a super-2 number, since 2×125826630557² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125826630157) 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, 1187043632 + ... + 1187043737.

It is an arithmetic number, because the mean of its divisors is an integer number (32050179495).

Almost surely, 2^125826630557 is an apocalyptic number.

It is an amenable number.

125826630557 is a deficient number, since it is larger than the sum of its proper divisors (2374087423).

125826630557 is an equidigital number, since it uses as much as digits as its factorization.

125826630557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374087422.

The product of its (nonzero) digits is 3024000, while the sum is 50.

The spelling of 125826630557 in words is "one hundred twenty-five billion, eight hundred twenty-six million, six hundred thirty thousand, five hundred fifty-seven".