155243221004 has 6 divisors (see below), whose sum is σ = 271675636764. Its totient is φ = 77621610500.

The previous prime is 155243220967. The next prime is 155243221013. The reversal of 155243221004 is 400122342551.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19405402622 + ... + 19405402629.

It is an arithmetic number, because the mean of its divisors is an integer number (45279272794).

Almost surely, 2^155243221004 is an apocalyptic number.

It is an amenable number.

155243221004 is a deficient number, since it is larger than the sum of its proper divisors (116432415760).

155243221004 is a wasteful number, since it uses less digits than its factorization.

155243221004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38810805255 (or 38810805253 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 155243221004 its reverse (400122342551), we get a palindrome (555365563555).

The spelling of 155243221004 in words is "one hundred fifty-five billion, two hundred forty-three million, two hundred twenty-one thousand, four".