155366421 has 16 divisors (see below), whose sum is σ = 237340800. Its totient is φ = 88558848.

The previous prime is 155366371. The next prime is 155366423. The reversal of 155366421 is 124663551.

It is not a de Polignac number, because 155366421 - 2⁹ = 155365909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155366423) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 456 + ... + 17633.

It is an arithmetic number, because the mean of its divisors is an integer number (14833800).

Almost surely, 2^155366421 is an apocalyptic number.

It is an amenable number.

155366421 is a deficient number, since it is larger than the sum of its proper divisors (81974379).

155366421 is a wasteful number, since it uses less digits than its factorization.

155366421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18508.

The product of its digits is 21600, while the sum is 33.

The square root of 155366421 is about 12464.6067326651. The cubic root of 155366421 is about 537.5914923396.

It can be divided in two parts, 1553664 and 21, that multiplied together give a square (32626944 = 5712²).

The spelling of 155366421 in words is "one hundred fifty-five million, three hundred sixty-six thousand, four hundred twenty-one".