20125513403 has 2 divisors, whose sum is σ = 20125513404. Its totient is φ = 20125513402.

The previous prime is 20125513361. The next prime is 20125513433. The reversal of 20125513403 is 30431552102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20125513403 - 2⁸ = 20125513147 is a prime.

It is not a weakly prime, because it can be changed into another prime (20125513433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062756701 + 10062756702.

It is an arithmetic number, because the mean of its divisors is an integer number (10062756702).

Almost surely, 2^20125513403 is an apocalyptic number.

20125513403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20125513403 is an equidigital number, since it uses as much as digits as its factorization.

20125513403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 20125513403 in words is "twenty billion, one hundred twenty-five million, five hundred thirteen thousand, four hundred three".