155238891801 has 24 divisors (see below), whose sum is σ = 240808656960. Its totient is φ = 88696897632.

The previous prime is 155238891767. The next prime is 155238891803. The reversal of 155238891801 is 108198832551.

It is not a de Polignac number, because 155238891801 - 2⁹ = 155238891289 is a prime.

It is a super-2 number, since 2×155238891801² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155238891803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1202340 + ... + 1325178.

It is an arithmetic number, because the mean of its divisors is an integer number (10033694040).

Almost surely, 2^155238891801 is an apocalyptic number.

It is an amenable number.

155238891801 is a deficient number, since it is larger than the sum of its proper divisors (85569765159).

155238891801 is a wasteful number, since it uses less digits than its factorization.

155238891801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131453 (or 131446 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 51.

The spelling of 155238891801 in words is "one hundred fifty-five billion, two hundred thirty-eight million, eight hundred ninety-one thousand, eight hundred one".