125402405105 has 16 divisors (see below), whose sum is σ = 159344087760. Its totient is φ = 94415142912.

The previous prime is 125402405099. The next prime is 125402405111. The reversal of 125402405105 is 501504204521.

It is an interprime number because it is at equal distance from previous prime (125402405099) and next prime (125402405111).

It can be written as a sum of positive squares in 8 ways, for example, as 9436956736 + 115965448369 = 97144^2 + 340537^2 .

It is a de Polignac number, because none of the positive numbers 2^k-125402405105 is a prime.

It is a super-2 number, since 2×125402405105² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1991057 + ... + 2053073.

It is an arithmetic number, because the mean of its divisors is an integer number (9959005485).

Almost surely, 2^125402405105 is an apocalyptic number.

It is an amenable number.

125402405105 is a deficient number, since it is larger than the sum of its proper divisors (33941682655).

125402405105 is a wasteful number, since it uses less digits than its factorization.

125402405105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85828.

The product of its (nonzero) digits is 8000, while the sum is 29.

Adding to 125402405105 its reverse (501504204521), we get a palindrome (626906609626).

The spelling of 125402405105 in words is "one hundred twenty-five billion, four hundred two million, four hundred five thousand, one hundred five".