155202421040 has 20 divisors (see below), whose sum is σ = 360845629104. Its totient is φ = 62080968384.

The previous prime is 155202421007. The next prime is 155202421057. The reversal of 155202421040 is 40124202551.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 970015052 + ... + 970015211.

Almost surely, 2^155202421040 is an apocalyptic number.

155202421040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155202421040 is an abundant number, since it is smaller than the sum of its proper divisors (205643208064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155202421040 is a wasteful number, since it uses less digits than its factorization.

155202421040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940030276 (or 1940030270 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 155202421040 its reverse (40124202551), we get a palindrome (195326623591).

The spelling of 155202421040 in words is "one hundred fifty-five billion, two hundred two million, four hundred twenty-one thousand, forty".