126402776525 has 12 divisors (see below), whose sum is σ = 156744721044. Its totient is φ = 101118816000.

The previous prime is 126402776503. The next prime is 126402776537. The reversal of 126402776525 is 525677204621.

It can be written as a sum of positive squares in 6 ways, for example, as 3901376521 + 122501400004 = 62461^2 + 350002^2 .

It is not a de Polignac number, because 126402776525 - 2³⁴ = 109222907341 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 126402776525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 892055 + ... + 1023995.

It is an arithmetic number, because the mean of its divisors is an integer number (13062060087).

Almost surely, 2^126402776525 is an apocalyptic number.

It is an amenable number.

126402776525 is a deficient number, since it is larger than the sum of its proper divisors (30341944519).

126402776525 is a wasteful number, since it uses less digits than its factorization.

126402776525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170272 (or 170267 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 47.

The spelling of 126402776525 in words is "one hundred twenty-six billion, four hundred two million, seven hundred seventy-six thousand, five hundred twenty-five".