155829559421 has 16 divisors (see below), whose sum is σ = 165263193600. Its totient is φ = 146521616688.

The previous prime is 155829559331. The next prime is 155829559423. The reversal of 155829559421 is 124955928551.

It is a cyclic number.

It is not a de Polignac number, because 155829559421 - 2¹⁸ = 155829297277 is a prime.

It is a super-3 number, since 3×155829559421³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155829559423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2254640 + ... + 2322726.

It is an arithmetic number, because the mean of its divisors is an integer number (10328949600).

Almost surely, 2^155829559421 is an apocalyptic number.

It is an amenable number.

155829559421 is a deficient number, since it is larger than the sum of its proper divisors (9433634179).

155829559421 is a wasteful number, since it uses less digits than its factorization.

155829559421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69008.

The product of its digits is 6480000, while the sum is 56.

The spelling of 155829559421 in words is "one hundred fifty-five billion, eight hundred twenty-nine million, five hundred fifty-nine thousand, four hundred twenty-one".