125123997749 has 4 divisors (see below), whose sum is σ = 125179193664. Its totient is φ = 125068801836.

The previous prime is 125123997731. The next prime is 125123997781. The reversal of 125123997749 is 947799321521.

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 a de Polignac number, because none of the positive numbers 2^k-125123997749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125123997949) 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, 27594557 + ... + 27599090.

It is an arithmetic number, because the mean of its divisors is an integer number (31294798416).

Almost surely, 2^125123997749 is an apocalyptic number.

It is an amenable number.

125123997749 is a deficient number, since it is larger than the sum of its proper divisors (55195915).

125123997749 is an equidigital number, since it uses as much as digits as its factorization.

125123997749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55195914.

The product of its digits is 8573040, while the sum is 59.

The spelling of 125123997749 in words is "one hundred twenty-five billion, one hundred twenty-three million, nine hundred ninety-seven thousand, seven hundred forty-nine".