125515401011 has 32 divisors (see below), whose sum is σ = 178437385728. Its totient is φ = 84970160640.

The previous prime is 125515400999. The next prime is 125515401047. The reversal of 125515401011 is 110104515521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 125515401011 - 2⁶ = 125515400947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125515401071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3670925 + ... + 3704958.

It is an arithmetic number, because the mean of its divisors is an integer number (5576168304).

Almost surely, 2^125515401011 is an apocalyptic number.

125515401011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

125515401011 is a deficient number, since it is larger than the sum of its proper divisors (52921984717).

125515401011 is a wasteful number, since it uses less digits than its factorization.

125515401011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7375931.

The product of its (nonzero) digits is 1000, while the sum is 26.

Adding to 125515401011 its reverse (110104515521), we get a palindrome (235619916532).

The spelling of 125515401011 in words is "one hundred twenty-five billion, five hundred fifteen million, four hundred one thousand, eleven".