1201535455538 has 16 divisors (see below), whose sum is σ = 2014103780640. Its totient is φ = 532831687200.

The previous prime is 1201535455531. The next prime is 1201535455541. The reversal of 1201535455538 is 8355545351021.

It is a junction number, because it is equal to n+sod(n) for n = 1201535455492 and 1201535455501.

It is not an unprimeable number, because it can be changed into a prime (1201535455531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666038708 + ... + 666040511.

It is an arithmetic number, because the mean of its divisors is an integer number (125881486290).

Almost surely, 2^{1201535455538} is an apocalyptic number.

1201535455538 is a deficient number, since it is larger than the sum of its proper divisors (812568325102).

1201535455538 is a wasteful number, since it uses less digits than its factorization.

1201535455538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332079273.

The product of its (nonzero) digits is 1800000, while the sum is 47.

The spelling of 1201535455538 in words is "one trillion, two hundred one billion, five hundred thirty-five million, four hundred fifty-five thousand, five hundred thirty-eight".