125778761025997 has 4 divisors (see below), whose sum is σ = 131247402809760. Its totient is φ = 120310119242236.

The previous prime is 125778761025989. The next prime is 125778761026007. The reversal of 125778761025997 is 799520167877521.

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 125778761025997 - 2³ = 125778761025989 is a prime.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125778761022997) 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, 2734320891847 + ... + 2734320891892.

It is an arithmetic number, because the mean of its divisors is an integer number (32811850702440).

Almost surely, 2^{125778761025997} is an apocalyptic number.

It is an amenable number.

125778761025997 is a deficient number, since it is larger than the sum of its proper divisors (5468641783763).

125778761025997 is an equidigital number, since it uses as much as digits as its factorization.

125778761025997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5468641783762.

The product of its (nonzero) digits is 933508800, while the sum is 76.

The spelling of 125778761025997 in words is "one hundred twenty-five trillion, seven hundred seventy-eight billion, seven hundred sixty-one million, twenty-five thousand, nine hundred ninety-seven".