1225720136157 has 32 divisors (see below), whose sum is σ = 1832944063104. Its totient is φ = 722125516800.

The previous prime is 1225720136149. The next prime is 1225720136167. The reversal of 1225720136157 is 7516310275221.

It is a happy number.

It is not a de Polignac number, because 1225720136157 - 2³ = 1225720136149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225720136167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1260468 + ... + 2010029.

It is an arithmetic number, because the mean of its divisors is an integer number (57279501972).

Almost surely, 2^{1225720136157} is an apocalyptic number.

It is an amenable number.

1225720136157 is a deficient number, since it is larger than the sum of its proper divisors (607223926947).

1225720136157 is a wasteful number, since it uses less digits than its factorization.

1225720136157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3270829.

The product of its (nonzero) digits is 176400, while the sum is 42.

The spelling of 1225720136157 in words is "one trillion, two hundred twenty-five billion, seven hundred twenty million, one hundred thirty-six thousand, one hundred fifty-seven".